A host microcontroller can communicate and configure the nRF24L01+ over a 4-pin Serial Peripheral Interface (SPI). The configuration registers are accessible through the SPI connection. Configurable parameters include frequency channel (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 which allows 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's radio uses Gaussian Frequency-Shift Keying (GFSK) modulation as well as fast Automatic Gain Control (AGC).The module includes an Interrupt Request (IRQ) pin which can be used to wake the host microcontroller, (: for ArduinoIDE), from sleep when the module receives a transmission providing great power conservation in battery devices.Range: 800+ meters line of sightFrequence: 2.4GHz~2.5GHzOperating voltage: 3 ~ 3.6V MaxMax Current: 115mAMulti-frequency: 125 frequencyColour:blackMaterial:PCB+Plastic+MetalSize:41mm x 15.5mmPackage Contents:2 * Wireless Module2 * AntennaOnly 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.