This Dual-Channel TENS Device offers 16 massage modes and 20 strength levels. And it shows current massage mode, strength level and preset time of 2 channel on LCD screen. Besides, it supports adjusting time from 10 to 60 minutes. Feature: Dual-Channel TENS Device Adopt TENS low-frequency pulse techniques to relieve pains. And with dual-channel output, it allows use by 2 person or in different areas. Considerate Design It offers 16 massage modes and 20 strength levels, free to choose to fulfil your different needs. Note: 2 strength levels adds one bar at the screen. LCD Display You can easily get to know the current massage mode, strength level and preset time of 2 channels. Adjustable Timer You can adjust time from 10 to 60 minutes by pressing "T" button, and it increases 10 minutes by each press. Long Lasting Battery With built-in 200mAh battery, you can use it for a long time, and the remaining power of it is displayed on LCD screen. Specification: Material: ABS Channel quantity: 2 Input voltage: AC 100~240V Output voltage: 5V Output current: 500mA Power: 2.5W Default time: 20min Battery capacity: 200mAh Display mode: LCD display Mode: 16 modes Strength levels: 0-20 Item size: 95* 51* 10mm/ 3.74* 2.01* 0.39in Item weight: 53.2g/ 1.88oz (Only the host) Packing list: 1 * TENS Device 4 * Electrode Pads (2 Medium, 2 Small) 2 * Electrode Cables ( 1 in 2 cable) 1 * USB Cable 1 * Pad Holder 1 * Power Adapter 1 * User Manual 1 * Acupoint Diagram