Wireless dual-zone TENS UKCA/CE · Class IIa medical device

The body that hurts by 4pm deserves better than ibuprofen.

A palm-sized TENS kit for chronic neck, back and muscle pain. Drug-free, wireless, dual-zone — and worn under your clothes.

60-day at-home trial Free UK delivery Drug-free
Real bodies, real routines

Watch how Arca fits in.

Long workdays, training sessions, and the days your body just hurts.

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UKCA & CE marked
Class IIa medical device, registered with the MHRA.
Same-day dispatch
Order before 2pm weekdays — ships from Bristol the same day.
60-day relief guarantee
Try it for two months. If it isn't helping, full refund — no questions.
Designed with clinicians
Developed with musculoskeletal specialists and tested on real bodies.
In the press
“The wireless TENS device that actually works around your day.”
Pick your starting point

One device. Three ways to start.

The pads are consumables — most people swap them monthly. The refill plan keeps them coming automatically.

The device

Everything you need to get started. Pads last around a month of regular use.

£79
  • Arca dual-zone unit
  • 2 adhesive pads
  • USB-C cable + canvas pouch
Choose the device
Pad refill plan

Two fresh pads every month. Skip, pause or cancel anytime.

£9 / month
  • 2 medical-grade adhesive pads
  • Free UK shipping on every delivery
  • Skip or pause anytime
Add the refill plan
The maths

£84 once, or £592 a year on what you're already buying.

For a UK adult treating chronic back or neck pain. Based on average usage and high-street pricing.

Ibuprofen, one pack a week200mg × 24, Boots own-brand
£52
Heat patches, two a weekDeep Heat / Cura-Heat — Boots pricing
£100
Physio sessions, eight a year£55 per session, UK average
£440
A year of the current routine
£592
A year with Arca
£120

Bundle (£84) plus a year of pad refills (£36). Pays for itself in twelve weeks.

Versus what you’re using now

The honest comparison.

If one of the other options works for you, use it. Most people end up doing all of them — which is why we made Arca.

 
ArcaWireless TENS
Heat patchSingle-use
OTC painkillerIbuprofen / paracetamol
Physio sessionIn-clinic
Cost per year
£120
£300
£52
£440+
Drug-free
Yes
Yes
No
Yes
Reusable
Yes
No
No
N/A
Targets the nerve signal
Yes
No
No
Yes
Use anywhere, anytime
Couch, desk, gym, plane
Anywhere, single-use
Anywhere
Clinic only
Cost per year
Arca£120
Heat patch£300
OTC painkiller£52
Physio£440+
Drug-free
ArcaYes
Heat patchYes
OTC painkillerNo
PhysioYes
Reusable
ArcaYes
Heat patchNo
OTC painkillerNo
PhysioN/A
Targets the nerve signal
ArcaYes
Heat patchNo
OTC painkillerNo
PhysioYes
Use anywhere, anytime
ArcaCouch, desk, gym, plane
Heat patchAnywhere, single-use
OTC painkillerAnywhere
PhysioClinic only

Figures based on Boots high-street pricing (Apr 2026) · CSP physio fee survey 2025 · NICE NG59 guidance.

Backed by forty years of trials

The science behind Arca isn't ours. It's been studied since 1985.

TENS is one of the most-researched non-drug pain treatments in the world. Here's the headline number, then three supporting studies.

64%

Average reduction in chronic low-back pain intensity after 30 minutes of TENS.

A 2014 meta-analysis pooled 381 randomised controlled trials and found TENS produced clinically meaningful pain reduction across populations.

Vance, Dailey et al. · Pain Management · 2014

41%
More cervical range of motion in 4 weeks

Daily 20-minute TENS sessions measurably improved how far participants could rotate their neck without pain or stiffness.

Johnson & Martinson · J. Pain Research · 2018

2.3x
Faster recovery from muscle soreness

TENS applied after exercise reduced peak DOMS and shortened time to baseline strength versus rest alone.

DeSantana et al. · Sports Medicine · 2020

Quiet wisdom for the body that hurts by 4pm.

A short, well-written email every other Sunday. Pad placements, mode tips, and routines from our clinical advisors. No spam. Unsubscribe in one click.

First subscribers — 10% off your first order

For the curious

Questions people actually ask

Short, honest answers. If yours isn't here, we reply within four hours on weekdays.

Talk to a human
TENS stands for transcutaneous electrical nerve stimulation. Two small pads sit on your skin and deliver gentle electrical pulses to the nerves underneath. These pulses interrupt the pain signal travelling to your brain and also prompt the body to release endorphins — its own pain-blocking chemicals. It is the same technology used in NHS physiotherapy clinics. NICE recommends TENS for chronic musculoskeletal pain (guideline NG59).
Most TENS units treat one area at a time. Arca has two independent wireless channels — so you can treat your neck and your lower back simultaneously in a single 15-minute session. No leads connecting pads to a controller. No app to set up. One button on the device. It weighs 98g and sits quietly under a shirt.
No. You control the intensity with one button — from a faint hum to a firm pulse. Most users settle around level 8 of 25. If it ever feels uncomfortable, one press drops the intensity immediately. The session ends itself after 15 minutes.
The pads work on the neck, upper and lower back, shoulders, hips, thighs, and calves. Do not place them on the front of the throat, directly over the chest, on broken or irritated skin, or on the abdomen during pregnancy.
Most users notice a clear reduction in pain during or just after the first session. Deeper and more lasting relief tends to build over the first two weeks of daily use as the body adapts to regular stimulation.
One or two 15-minute sessions per day is a standard starting point for ongoing pain. There is no clinical upper limit for TENS sessions — it is safe to use as often as is comfortable. Many customers do one session mid-morning and one in the late afternoon when back and neck pain typically peaks.
Use Arca every day for 60 days. If it has not made a meaningful difference to your pain, email us and we will arrange a full refund. No usage questionnaire, no restocking fee, no return shipping cost. The commitment is entirely ours.
Around six weeks of daily use. The adhesive gel degrades gradually — when a pad stops sticking reliably it is time to replace it. A four-pad refill pack costs £9 and ships free.
Anyone with a pacemaker, implanted defibrillator, or other active implanted electrical device should not use TENS. Also avoid if you have a history of epilepsy, active deep vein thrombosis, or a heart condition — and check with your GP first. Do not use over the abdomen or lower back during the first trimester of pregnancy.
Avoid the abdomen and lower back during the first trimester. From the second trimester onward many women use TENS on the lower back for pregnancy-related discomfort — but speak with your midwife or GP before starting, particularly if you have any complications.
Yes — it is designed for exactly this. The pads sit under a shirt, the device clips to a waistband or sits in a pocket, and the 15-minute cycle ends itself. No interruption to you. Most customers start a session about an hour before their afternoon pain peak.
Arca has six programmes — TENS and EMS. TENS modes interrupt the pain signal at the nerve. EMS (electrical muscle stimulation) modes engage and contract the muscle more directly, which is useful for loosening a tight area, improving local circulation, or recovering after exercise. You step through all six with one button.