Ten minutes on it is the equivalent of 600 sit-ups!Wireless - Easy to Use / Wear anywherethere are 2 belt which are stretchy. The short is 25cm. The long is 50cm. They can be connected together to use6 'Smart' Programmed Routines with 10 variables levels of intensity for a complete and personalised workoutTiny Gentle Electronic Pulses are delivered to your musclesTones your Tummy， Waist， Legs， Arms and Bum Keep in Trim without the GymPacking Content:2 Adjustable Waist and Leg StrapsBattery Included (plus a spare)Full Instruction Manual Workout Guide IMPORTANT NOTE:THIS PRODUCT IS NOT SUITABLE FOR PREGNANT WOMEN