CC2500RTK (Texas Instruments) is a low-power 2.4 GHz RF transceiver controlled via SPI in a QFN-20 (4 × 4 mm) package.

• 2400 to 2483.5 MHz band · 1.2 to 500 kBaud data rate
• −104 dBm sensitivity at 2.4 kBaud · up to +1 dBm output power
• 13.3 mA in RX · 400 nA in SLEEP mode
• 1.8 V to 3.6 V supply · 64-byte TX/RX FIFOs

Minimum order: 2 pieces.

Data per TI CC2500 datasheet.