This post explains for the transceiver.
The Part Number is RDA1846S.
The function of this semiconductor is Single Chip Transceiver.
The package is 5×5 mm 32 pin QFN.
Manufacturer: RDA Microelectronics
Preview images :
The RDA1846S has a powerful digital signal processor, which makes it have optimum voice quality, flexible function options, and robust performance under varying reception conditions.
The transceiver uses the CMOS process with a package size of 5x5mm. By virtue of its high integration, it requires the least external components and eliminates the complicated design of sensitive RF circuits on PCB.
1. CMOS single-chip fully-integrated transceiver
2. Fully integrated frequency synthesizer and VCO
3. Digital auto frequency control (AFC)
4. Digital auto gain control (AGC)
5. Selectable pre/de-emphasis
6. Received signal strength indicator (RSSI)
7. DTMF and programmable in-band dual tone
8. Programmable in-band single tone transmitter
9. Auto RX/TX/SLEEP state switching
1. Cellular handsets
2. Family radio services
3. Walkie Talkies