Wireless - Easy to Use / Wear anywhere there are 2 belt which are stretchy.  The short is 25cm.  The long is 50cm.   They can be connected together to use. 6 'Smart' Programmed Routines with 10 variables levels of intensity for a complete and personalised workout Tiny Gentle Electronic Pulses are delivered to your muscles Tones your Tummy、 Waist、 Legs、 Arms and Bum   Keep in Trim without the Gym  Packing Content: 2 Adjustable Waist and Leg Straps Battery Included (plus a spare) Full Instruction Manual  Workout Guide