Built-in 7.4V 22000mA rechargeable battery powered, last half a year once fully charge, if operated 2 times (double round trip) a day. Maxim 501 times recharge Low voltage safety DC motor continuous running. No heating protection limitaion Electronic limit switch setting, six different limits setting Automatical limit positions correction function even motor brake failed higher safety, all built-in electronic parts sealed by complete box Dot move and continuous move switchable AM25-1/30-ES Ø25mm Electronic limit Motor, 12V, 1Nm 30rpm Compeletly wireless redio motor. Easy installtion and save cost. It is widely applied to hotels, villas, Shangri-La shade, wells menn shade, vehicles etc.