Features:USB online update makes you always enojoy the lastest programme. adjustability of hi-frequency output power enjoys more personality and friendly environment.up to 30-model data can be saved.DEVO-7E adjusting the gyro sensitivity makes hovering flight and fancy flight in an easy way.Wireless data transfer and trainer function between two transmittersImproved design of the Radiosticks make the control silky and smoothly4 different kinds of stick modesuitable for helicopter and airplane.Specifications:Model Name: Devo 7EProduct type: TransmitterEncoder��o7-channel micro computer systemFrequency: 2.4GHZ DSSSOutput power: <100mWCurrent Drain: 200mA(100mW)Battery: 5# Battery 4 * 1.5V Or Ni MH 4 * 1.2V 1600-2000mAh�ꡧNot included��?Output pluse: 1000-2000msPackage size: 26 * 20.5 * 11cm / 10.2 * 8.1 * 4.3inPackage weight��o876g / 1.9lb(w/o TX battery)Package list��o1 * Walkera DEVO 7E Transmitter(Not include Receiver & Transmitter Battery)??2 * Cable1 * CD