The CC2545 2.4GHz wireless transceiver SoC is a very low cost device aimed at HID applications such as wireless mice.
2.4GHz ISM Band RF Transceiver SoC 8051-core MCU with 32KB Flash memory, 1KB RAM RF Frequency Range: 2379 to 2496MHz ISM Band RF Output Power: up to +4dBm Receiver Sensitivity: -86dBm @ 2Mbps and 0.1% BER, -98dBm @ 250kbps and 0.1% BER Modulation: GFSK, MSK OTA Data Rate: 2Mbps AES-128 Security Coprocessor 40-bit Radio timer 8 channel 12-bit ADC Serial communication: USART, I²C 31 x GPIO pins (including 3 x 20mA LED drivers) Temperature sensor Various low-power operation modes Power supply: +2.0V to +3.6Vdc Operating temperature range: -40 to +85°C Applications: Human Interface Devices, Consumer Electronics, Local communication for the Internet of Things (IoT)