The real GFSK monolithic transceiver chip Built-in hardware and link layer Automatic response and automatic retransmission function Address and CRC check function Wireless rate: 1 or 2 MBPS SPI interface rate: 0 ~ 8MBPS 125 optional channels work Channel switching time is very short, can be used for frequency hopping Fully compatible with nRF24XX series I/O can accept 5v level of input ±60ppm 16MHz crystal Low working voltage: 1.9 ~ 3.6 V The global open ISM frequency band, the maximum 0dbm transmitted power, free license to use. Transmission distance up to 100 meters in outdoor open occasions! quantity:2 pcs Package include:2 pcs nRF24L01++ 2.4GHz Antenna Wireless Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.