OMRON Pocket Pain Pro TENS Unit (PM400) review

The OMRON Pocket Pain Pro (PM400) is the cheapest unit on this list by list price and the lightest at 0.16 lb. OMRON sets its MSRP at $51.99 and sells it through retailers, so shop around. It keeps things simple: 3 pain programs for arm and shoulder, lower back, and leg and foot, plus 2 massage-like modes called knead and steady, each with 10 intensity levels. Like the PM500, it uses Long Life Pads that OMRON rates for up to 150 uses, comes with a pad holder and 2 AAA batteries, and has a one-year limited warranty. Sessions run up to 15 minutes. The savings show in the hardware: there is no LCD screen, no belt clip and no storage case, and the single channel limits you to one area at a time. For about $28 more on MSRP, the PM500 adds a screen, more modes and finer control, and the TENS 7000 adds a second channel for about a dollar more.

Who it is for

occasional users who want the lowest list price

Price

$51.99 MSRP; sold through retailers listed on OMRON's site.

MSRP $ 51.99 Where to buy
Quoted from the vendor pricing page on November 14, 2026.

Key features

• 3 preset pain programs: arm and shoulder, lower back, leg and foot
• 2 massage-like modes: knead and steady
• 10 intensity levels
• Long Life Pads reusable up to 150 times
• Weighs 0.16 lb and runs on 2 AAA batteries

Strengths and weaknesses

• Strength: Lowest list price on this list at $51.99 MSRP
• Strength: Lightest unit here at 0.16 lb
• Strength: Sold without a prescription, with sessions as short as 15 minutes
• Weakness: No LCD screen
• Weakness: Only 10 intensity levels and a single channel
• Weakness: No belt clip or storage case

Key facts

• Channels: Single
• Modes: 3 pain + 2 massage
• Intensity levels: 10
• Weight: 0.16 lb
• Power: 2 AAA batteries
• Price: $51.99 MSRP

Where it ranks

OMRON Pocket Pain Pro TENS Unit (PM400) is No. 7 in our Best TENS Units verdict.