If you want to make your wireless communication system with low cost, this Wireless Transceiver module is the suitable module to ! It can achieve a good balance between wireless transition performance and cost! You can easily make it with your own MCU/ARM/PIC/AVR/STM32 system! What's more, this NRF24L01+ module is designed with amplifier and antenna, this allowed you the wireless communication up to 800+ meters! (No barrier) A microcontroller can communicate and configure the nRF24L01+ over a 4-pin Serial Peripheral Interface (SPI). The configuration registers are accessible via the SPI connection. Configurable parameters include channel frequency (125 selectable channels), output , and data rate (data rates: 250kbps, 1Mbps, and 2Mbps). The on-chip voltage regulator accepts supply voltages from 1.9 to 3.6V. The module has 5V tolerant inputs allow for direct connection of SPI pins to the ( with) for arduinoIDE. Internal filtering results in high margins of meeting RF regulatory standards. The module radio uses Gauss Frequency-Shift Keying (GFSK) modulation as as fast Automatic Gain Control (). The module contains an Interrupt Request () pin can be used to wake the microcontroller, (: for ArduinoIDE), from when the module receives a transmission providing great energy savings in battery devices. Range: 800+ meters line of sight Frequency: 2.4GHz ~ 2.5GHz Working Voltage: 3~3.6V Max Max Current: 115mA Multi-frequency: 125 frequency Colour: black Material: PCB+plastic+metal Package Contents: 4 * Wireless Module 4 * Antenna 4 * NRF24L01 Wireless Module Breakout Adapter Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.