Metal Frame Rechargeable 3.5-CH R/C Indoor Helicopter. This rechargeable 3.5-CH palm-size mini R/C helicopter set is with simple operation for easy to fly. The 3.5-channel helicopter is easy to control and with great performance. There is built-in gyroscope for smooth flight. The 3.5-channel helicopter is designed in mini size for convenient to carry and fly indoor. Wide infrared control system. Gyroscope technology. Built-in 130mAh rechargeable battery. Around 10 mins of flying time on a full charge. Buy this and Get 10% OFF Metal Frame Rechargeable 3.5-CH R/C Indoor Helicopter. Plus Get Free Shipping@DX.com.