The elephant door™ has a built-in 2500 mAh Li-Poly battery. With it, the device can operate up to 40 days in an average use and up to 17 days in detection mode (turned ON 24h). The device is charged via a Micro USB cable, delivered with the device. It takes 8 hrs to fully charge the battery when connected to a PC USB port, or 4 hrs if connected to the mains.