Built-in Rechargeable BatteryWith built in Li-ion battery , the robotic dog can last 3 hours after full charge. Comes with the USB charger, it is very fast and convenient to charge. | Obstacle AvoidanceI am smart! When run into any obstacle, i have the infrared sensor inside so i can detect and avoid it. No worry, i will stay with you all the time. | Press The HeadI have another trick . Short press my head, i will make cute behaviors randomly. If you need to take a rest, you can just long press my head. |