Feature: 1. 4-in-1 Muscle Stimulator: Our upgrade electric muscle stimulator with TENS/EMS/massage function. TENS blocks the transmission of pain nerve signals, and EMS stimulates stationary muscles to prevent atrophy. Massage regulates body fluid circulation. Effectively pain relief and eliminate fatigue, improving the physiological functions of the human body. Supports personalized DIY adjustment and frequency setting. 2. Dual Output and Versatile Use: The electronic TENS massager dual output design allows to use it for 2 different body areas, or by 2 people simultaneously. Effectively pain relief for neck, shoulders and back. Muscle building for chest, abdominal and back. 3. Multiple Modes and Flexible Adjustment: Tens unit muscle stimulator with 8 Tens modes, 8 EMS modes, 8 Massage modes and 1 DIY mode. 10-90 minutes time and 30 levels strength adjustable. Specification: Features: 4-in-1 Muscle Stimulator: Our upgrade electric muscle stimulator with TENS/EMS/massage function. TENS blocks the transmission of pain nerve signals, and EMS stimulates stationary muscles to prevent atrophy. Massage regulates body fluid circulation. Effectively pain relief and eliminate fatigue, improving the physiological functions of the human body. Supports personalized DIY adjustment and frequency setting. Dual Output and Versatile Use: The electronic TENS massager dual output design allows to use it for 2 different body areas, or by 2 people simultaneously. Effectively pain relief for neck, shoulders and back. Muscle building for chest, abdominal and back. Multiple Modes and Flexible Adjustment: Tens unit muscle stimulator with 8 Tens modes, 8 EMS modes, 8 Massage modes and 1 DIY mode. 10-90 minutes time and 30 levels strength adjustable. Reusable and Long Standby: 3 pairs of reusable electrode pads enables much better performance and easy clean up to 15-20 times uses for a long lifespan. Built in Powerful Rechargeable Lithium battery, it can be connected to wall charger, power bank or laptop USB port to charge. Compact and Portable: Electric muscle stimulator with pocket size and lightweight, easy to store and carry. Relax any time anywhere . Convenient for you to use in the office, car or travel on the go. Specification: Color: Sliver Main Material: ABS Working voltage: 3.3-4.3V Working current: ≤60mA Charging port: Type-C Working time: 10-90 minutes Battery capacity: 300mAh/4.5V Packing List: 1 * Muscle stimulator 1 * Charging cable 2 * Leads 3 * Pairs of electrode pads 1 * Manual Package List: 1 * Muscle stimulator 1 * Charging cable 2 * Leads 3 * Pairs of electrode pads 1 * Manual