Compex Performance 3.0 Muscle Stimulator with Tens Kit, Helps facilitate and Improve Performance, 6 Programs, Gray COMPLETELY REDESIGNED – Water resistant silicone sleeve, improved LCD display, center navigation button, and grip. UP TO 8 HOURS OF STIMUATION – USB rechargeable Lithium Ion battery 6 PROGRAMS – 1 Warm Up, 3 Strength, 1 Recovery, 1 TENS AID PERFORMANCE & RECOVERY – Take your workouts to the next level by using the Performance 3.0 before, during, or after a workout