If you want to make your wireless communication system with low cost, this Wireless Transceiver module is the most suitable module to choose! It can achieve a good balance between wireless transition performance and cost! You can with your own MCU or ARM or PIC or AVR or STM32 system! What's more, this NRF24L01and module is designed with power amplifier and SMA antenna, this allowed you the wireless communication up to 800and meters! (No barrier) A host microcontroller can communicate and configure the nRF24L01and 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 power, 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 that allow for direct connection of SPI pins to the (compatible 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 well as fast Automatic Gain Control (). The module contains an Interrupt Request () pin that can be used to wake the host microcontroller, (ex: for ArduinoIDE), from sleep when the module receives a transmission providing great energy savings in battery power devices. Range: 800and 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: PCBandplasticandmetal 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 cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.