Color: Green - Material: PCB - With RF2401B wireless communication module - 2.4GHz ISM frequency range - Up to 1Mbps working speed - 125 channels - High anti-jamming GFSK modulation - 8 / 16-bit CRC cyclic redundancy check and point to multi-point mailing address control - Achieves wireless network communication with TDMA / CDMA / FDMA theory - Voltage: 1.9~3.6V standby power consumption: 1uA - Allows to set address - Receive and transmit indicator supports up to 28-bit - Built-in voltage-stabilized power supply - Standard DIP pitch - CLK / DATA / DR interface for easy programming - Dual receiving channels built-in antenna up to 20 meters communication range