The smart dumbbell includes both parts hardware(Dumbbell & Sensor Module) and software(APP). The technology is combined with Mobile APP(Move it) through Bluetooth connecting. There are over 100+ interactive training course in the APP, you can exercise with guidance. The sensor fixes in the dumbbells, and can track your action and give feedback to you in real-time when you are exercising. It will tell if you do exercise correctly or not. Charging time is 2 hours and can be used for 8 hours continuously. Its weight is .75KG and is suitable for intermediate users.