This is one of the semiconductor types. This part name is LT8900.
This product has Low Cost 2.4GHz Radio Transceiver functions.
Manufacturers of product is ETC.
Image and pinout :
LT8900 PDF Datasheet
Some of the text files within the PDF file
LT8900 Datasheet Revision 1.2 LT8900 Low Cost 2.4GHz Radio Transceiver FEATURES z Complete 2.4 GHz radio transceiver includes fully integrated RF PLL and channel filtering z Supports Frequency-Hopping Spread Spectrum z Supports SPI and I2C bus interface z Built-in smart auto-acknowledge Tx/Rx protocol simplifies usage z Packet data rate 1 Mbps over-the-air z FIFO flag signal permits continuous streaming data at 1 Mbps over-the-air z Power management for minimizing current consumption z Digital readout of RSSI and temperature z Lead-free 4x4mm QFN Package & SOP16 for best RF performance GENERAL DESCRIPTION The LT8900 is a low-cost, fully integrated CMOS RF transceiver, GFSK data modem, and packet framer, optimized for use in the 2.4 GHz ISM band. It contains transmit, receive, RF synthesizer, and digital modem functions, with few external components. The transmitter supports digital power control. The receiver utilizes extensive digital processing for excellent overall performance, ev [ … ]
Please refer to the file for details.