BLADE Nano QX RTF Quadcopter Features exclusive SAFE&#8482; technology with stability and agility modes Small enough to fly in any room or office Tough, lightweight airframe with blade guards Potent brushed motors that provide smooth and powerful lift. 4-in-1 DSMX Receiver/ESCs/mixer/SAFE sensor unit Please read the user manual under Product Details & also contact Horizon Hobby at 800.959.2305 for any Technical Support.Battery:3.7V 1S 150mAh 25C LiPo