The Futaba R214GF-E is a small 4 channel receiver designed for use in electric rc cars, trucks, tanks and other surface vehicles. It comes in a hard case that has the antenna conveniently built-in for a clean installation. It uses the Futaba FHSS 2.4GHz surface radio system. Specification Modulation: Futaba S-FHSS Surface Weight: 6g Channels: 4 Dimensions: 35.1 x 23.2 x 9mm Frequency: 2.4GHz