This is a professional antenna transceiver moudle, with built- .4Ghz antenna. Its maximum operating speeds up to 2Mbps and it has GFSK modulation efficiency, - ability, particularly suitable for industrial control applications. 125 Channels, Multi-point and hopping to meet the needs and built-in error , Multipoint address control.Low-power 1.9 ~ 3.6V, only 1uA on mode.It is really a wonderful transceiver moudle for choice. Features - ColorBlack - Size: 34mm * 17mm * 1mm. -Maximum operating speeds up to 2Mbps. - GFSK modulation efficiency, - ability, Particularly suitable for industrial control applications. - 25 Channels, Multi-point and hopping to meet the needs. - Built-in error , multipoint address control. - Built- .4Ghz antenna and voltage regulator. - output indicator. - Applications: car alcohol alarm, and breathalyser. - Standard DIP Pitch Interface for embedded applications. - Low-power 1.9-3.6V, only 1uA on mode. - Available software to set the address, only received local Address when output data(Provide interrupt instruction), can be directly connected to a variety of microcontrollers, Software programming is very convenient. Package list: 3 * 5pcs Professional 2.4GHz Antenna Transceiver Module