iStim X1 Wireless Heat TENS Unit with Remote Control

iStim X1 Wireless Heat TENS Unit with Remote Control

The iStim X1 Wireless Heat TENS Unit is a rechargeable, wearable device that combines transcutaneous electrical nerve stimulation with selectable superficial heat. Unlike a conventional TENS machine with separate lead wires and a controller clipped to clothing, the X1 attaches directly to the treatment area using two proprietary self-adhering gel pads.

Use the wireless remote—or the buttons on the main unit—to adjust the TENS intensity and select low or high heat. The broad, flexible design is especially convenient for temporary relief of minor aches and discomfort involving the back, waist, shoulders, arms, or legs after exercise and everyday activities.

The current kit includes eight Japanese-gel electrode pads, a rechargeable remote control, charging equipment, and two storage boards. 

Key features

• Combines TENS and superficial heat in one wearable device

• Cord-free design with no external electrode lead wires

• Wireless remote control

• 15 adjustable TENS intensity levels

• Two heat settings

• Use TENS alone, heat alone, or both together

• Automatic treatment shutoff

• Rechargeable internal battery

• Broad flexible treatment surface

• Eight reusable proprietary gel pads

• Two electrode storage boards

• Over-the-counter home-use design

• Manufactured in Taiwan

The FT-810R device has a rechargeable 3.7-volt lithium battery, symmetrical biphasic stimulation, a 20-minute TENS timer, and low and high heat settings that reach a maximum temperature of about 43°C or 109°F.

Quick product specifications

The 15-level adjustment applies to the electrical stimulation, not the heat output. Heat has two choices: low and high.

What does “wireless TENS” mean?

The X1 does not require conventional lead wires running from a handheld controller to four separate electrodes. Instead:

1. Two gel pads attach directly to conductive areas on the back of the X1.

2. The complete device adheres to the treatment area.

3. A wireless remote adjusts TENS intensity and heat.

4. The main unit remains attached during the session.

This design reduces cable handling and makes the X1 easier to position beneath loose-fitting clothing. It is particularly useful when a user wants to treat one broad area without arranging multiple individual pads.

For a wider selection of traditional and wireless devices, visit Balego’s TENS units and accessories collection.

What condition is the iStim X1 intended to relieve?

The FDA-cleared intended use of the FT-810R platform is temporary relief of pain associated with sore and aching muscles in adults, involving the

• Shoulders

• Waist

• Back

• Arms

• Legs

The discomfort should be associated with strain from exercise or ordinary household activities. The superficial-heat function is intended for temporary relief of minor aches and pains.

The X1 is intended for temporary symptomatic relief. It does not diagnose the source of pain or correct an underlying injury.

How TENS and heat work together

TENS function

Transcutaneous electrical nerve stimulation delivers electrical pulses through gel pads placed on the skin. The stimulation is intended to create a strong but comfortable tingling sensation in the treatment area.

TENS should not feel burning, sharply painful, or intolerable. More intensity does not automatically produce better relief.

Learn more about stimulation patterns in our guide to Normal, Burst, Modulation, SD1, and SD2 TENS modes.

Superficial heat function

The X1 provides two levels of localized warmth:

Heat may be used alone or with TENS. Turn the heat off immediately if it feels excessively hot or uncomfortable. Users with impaired skin sensation, diabetes, neuropathy, or circulation concerns should consult a healthcare professional before using the heat feature.

Available operating combinations

What comes with the iStim X1?

How to use the iStim X1

1. Charge the unit and remote

Fully charge the X1 and its remote control before the first use. Use the supplied charging equipment.

Do not operate the X1 while it is connected to a charging source.

2. Prepare the skin

Wash and completely dry the selected treatment area. Remove:

• Lotion

• Skin oil

• Sweat

• Cosmetic products

• Topical analgesics

• Conductive gel

Clean, dry skin helps the pads adhere evenly and reduces the chance of concentrated or uncomfortable stimulation.

3. Attach the proprietary gel pads

Apply one X1 gel pad to each marked electrode area on the back of the device. Align the pad with the electrode profile and do not allow its edge to extend beyond the conductive area.

Do not apply extra electrode gel. The manufacturer specifically warns that additional gel can damage the pads and interfere with performance. 

4. Place the device on the treatment area

Remove the protective liner and apply the complete X1 to intact skin. Press over the entire surface so that both pads make full contact.

Do not place the unit

• Across the chest

• Over the front or side of the neck

• Over the carotid arteries

• Directly over the head

• Over the mouth or throat

• Over broken or infected skin

• Over an area with reduced sensation

5. Turn on TENS

Press and hold the TENS control on the main unit. Begin at the lowest setting, then increase the intensity.

The desired feeling is pronounced but comfortable sensory stimulation—not pain, burning, or an aggressive muscle contraction.

6. Add heat when appropriate

Activate the heat feature and begin with Low. Allow time for the temperature to stabilize before deciding whether high is needed.

Heat is optional. The TENS function can continue without it.

7. Use the wireless remote

The remote can control the selected function and intensity without reaching beneath clothing or behind the back. Only adjust one step at a time.

8. Complete the session

The unit shuts off automatically after:

• 20 minutes in TENS-only mode

• 20 minutes with TENS and heat

• 10 minutes in heat-only mode

Wait at least 30 minutes between applications unless the current instructions or a healthcare professional directs otherwise.

9. Remove and store the pads

Turn the device off before removing it. Lift the unit carefully rather than pulling quickly from the skin.

Cover the pads with the supplied parking boards and store the components in a cool, dry place.

Proprietary X1 electrode pads

The X1 does not use the standard 2 mm pin-style electrodes found on most conventional TENS devices. Its two large pads adhere directly to the conductive underside of the wearable unit.

Pad care and replacement

After treatment:

1. Turn off the device.

2. Remove it slowly from the skin.

3. Reapply the storage boards.

4. Keep the pads away from lint, hair, dust, lotion, and oil.

5. Store them away from sunlight and excessive heat.

A slightly damp, lint-free cloth may be used to remove light contamination from the gel surface. Do not soak the pads or use alcohol, solvents, abrasive cleaners, or additional conductive gel.

Replace the pads when:

• The device no longer adheres securely

• Corners repeatedly lift

• Stimulation becomes concentrated or sharp

• The X1 beeps and turns off despite correct placement

• The gel is damaged or heavily contaminated

• Skin irritation develops

Poor adhesion can produce uneven current density and increase the possibility of discomfort or skin irritation.

Safety and contraindications

Do not use the X1 if you have:

• A pacemaker, implanted defibrillator, or another implanted electronic device

• An insulin pump

• A known serious heart-rhythm disorder

• Epilepsy or another seizure disorder

• An active malignancy

• A high fever

• Pregnancy

• A metallic implant in the proposed treatment area unless a healthcare professional has approved use

Do not apply the device:

• Across or near the heart

• Across the chest

• On the front or side of the neck

• Over the carotid arteries

• Over the skull, mouth, throat, or larynx

• Over genital areas

• Over open wounds, burns, rashes, swelling, bruising, infection, or incompletely healed surgical sites

• Over skin with impaired sensation

• In a bath, shower, or humid environment

Do not use it:

• While sleeping

• While driving

• While operating machinery

• After consuming alcohol

• With another electrical-stimulation device

• While connected to the charger

• Near operating shortwave or microwave therapy equipment

Consult a healthcare professional before use when pain is unexplained, persistent, worsening, or associated with a significant injury or medical condition. The official device documentation also advises medical consultation for diabetes, sensory impairment, coagulation disorders, skin disease, and ongoing medical treatment.

Troubleshooting

Choose the iStim X1 if you:

• Built-in heat is a priority.

• Lead wires are inconvenient.

• One broad treatment region is sufficient.

• A remote-controlled wearable design is preferred.

• Simple preset timing is more important than parameter customization.

For a full introduction to these different stimulation goals, read Balego TENS vs. NMES: Key Differences, Uses, Benefits, and Safety.

Frequently asked questions

Is the iStim X1 truly wireless?

Yes. The main unit attaches directly to its gel pads and does not use external electrode leads. A radio-frequency remote adjusts the device.

Is the X1 a TENS or EMS machine?

The X1 should be presented as a TENS and heat device. Its cleared intended use concerns temporary pain relief; it is not positioned for muscle strengthening or neuromuscular re-education.

For combined TENS and muscle stimulation, compare the iStim EV-804 Rechargeable TENS/EMS Unit.

Can TENS and heat operate simultaneously?

Yes. The FT-810R is designed to deliver electrical stimulation and superficial heat at the same time.

Can heat be used without TENS?

Yes. Heat-only operation is available and automatically ends after approximately 10 minutes.

How hot does the device become?

The technical documentation lists approximately 41°C, or 106°F, on Low and up to 43°C, or 109°F, on High. Actual perceived warmth varies with placement, skin condition, contact, and individual sensitivity.

Does it have 15 heat levels?

No. It has 15 electrical-stimulation intensity levels and two heat settings.

Can I apply extra electrode gel?

No. The X1’s pads contain their own adhesive conductive gel. Additional gel can impair adhesion or damage the pad.

Can I use ordinary Balego TENS pads?

No. Conventional pin-style electrodes will not attach directly to the X1. Use replacement pads specifically identified as compatible with the iStim X1 or FT-810R.

Why does the X1 beep and turn off?

The contact-detection system might sense an incomplete connection between both gel pads and the skin. Clean and dry the area, press the device down evenly, and replace worn pads when necessary.

Can it be placed directly over the spine?

Avoid applying it directly over prominent bone or in a position prohibited by the instructions. Placement beside the spinal column over appropriate back musculature is different from placing the unit over the front of the neck, chest, or other contraindicated area.

For general education, visit our TENS electrode placement and settings library.

Can I use it while charging?

No. Disconnect it from the charger before placing it on the body.

Can I sleep while using it?

No. The device should not be operated while sleeping.

Can it be worn while driving?

No. Do not use electrical stimulation while driving or operating machinery.

Is temporary redness normal?

Mild redness that disappears shortly after treatment can occur. Stop treatment and obtain medical guidance when redness persists or is accompanied by itching, inflammation, blistering, or pain.

Why buy the iStim X1 from Balego?

The iStim X1 Wireless Heat TENS Unit is supported by Balego’s experience in electrotherapy, TENS devices, electrodes, rehabilitation products, and patient education.

Customers also receive:

• Free shipping across the United States

• Balego’s Best Price Guarantee

• Access to Balego’s TENS education and device guides

• Alternative wired, wireless, TENS-only, and TENS/NMES product options

• Product assistance through the Balego contact page