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