Flysky Noble NB4+ 2.4GHz 8CH Radio TX, RC Transmitter with FGR4B RC Receiver, AFHDS 3 Protocol - Remote Controller, Surface Radi

To attach the base: 1. Line up the base so that the transmitter handle has a slight over hang on the back. 2. Carefully insert the base contacts into the hole in the bottom of the handle. 3. Hold the handle firmly and pull the battery backwards. When it is secure you should hear a click. - Transmitter Specifications (Noble NB4+) Product model: Noble NB4+ Adaptive Receivers: FGr4B and other AFHDS 3 receivers Adaptive Models: Car or Boat Number of Channels: 8 RF: 2.4GHz ISM Maximum Power: < 20 dBm(EU) Low Voltage Alarm: < 3.65V Data Output: USB Type-C Charging Jack: USB Type-C Antenna Type: External single antenna Display: 3.5-inch 320*480 full dot matrix color IPS touch screen Resolution: 4096 Distance: >300m (Ground distance without interference) Online Update: Yes Temperature Range: -10 C+60 C Humidity Range: 20%95% Color: Black Dimensions :131.41*115.95*190.56mm Weight :520g Certification: CE,SRRC,FCC ID:2A2UNNB4PLUS00,MIC,RCM - Receiver Specifications (FGr4B): Product Model :FGr4B PWM Channels :4 RF :2.4GHz ISM 2.4GHz Protocol: AFHDS 3 Antenna Type: Single Antenna Input Power :3.59V/DC Data Output :PWM/PPM/i-BUS2/S.BUS/i-BUS Temperature range: -10? +60? Humidity Range :20% 95% Online Update: Yes Dimensions: 17*29*16.6mm Weight: 6.4g Certifications: CE, FCC ID: N4ZFGR4B000