HiRobot work with iPod touch, iPhone or Android devices. Long distance remote control. Identify the driving route automatically. photo and video recording. The driving direction is detected by the infrared sensor under the tank. it can change another pathway freely when it drives at the parthway. the robot can detect dropping. When it drives approaching the edge zone, it can return by itself and avoid dropping off. specification: driving time: 10mins, charge time: 50mins, control distance: 30-50 meters. Battery：3.7V Li-Po 350mAh, Size: 14.1*10.7*4.6cm