• The nRF24L01+ is a 2.4GHz ISM band transceiver
• Range: 800+ meters line of sight (refer to "Important Note" section below)
• Includes on board support components and the RFX2401C which is the PA (Power Amplifier) and LNA (Low-Noise Amplifier)
• 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 Arduino.
• 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, (ex: Arduino), from sleep when the module receives a transmission providing great power conservation in battery devices.
• Auto-acknowledge and auto-retransmit abilities
• Weight: 13.28 g (0.468 oz)
• Board dimensions, excluding pins: 15.5mm (0.61") width x 40.7mm (1.6") length x 12.2mm (0.48") height
• Dimensions of antenna, when angled at 90 degrees: 87mm (3.43") height x 9.5mm (0.37") diameter

To maximize the transmission/reception distance (range) we recommend the following:

• using a slower data rate, preferrably 250kbps
• in addition to the GND header pin we recommend also connecting your source ground to the ground through-holes or castellations near the brass antenna connector
• adding a 10uF capacitor across GND and V+ to assist with power demands during transmitting and receiving
• using a dedicated 3.3V power source instead of an Arduino's 3.3V supply, a good 3.3V regulator such as the LD33V works well