At only 3.5 grams and 19mm x 30mm x 9mm (WxLxH), the AR6100 is the ultimate 2.4GHz receiver for most any small electric model from mini profile foamies to 400 class helis. Because it uses advanced DSM2™ technology, it is only compatible with the new DX7 aircraft system. It also boasts a wide input range that allows it to operate with 3.5- to 9-volt electrical systems.