The YL-105 is a low-cost, low-power wireless transceiver module designed for various short-range wireless applications. It is based on the A7105 RF chip by AMICCOM. It operates in the 2.4GHz ISM band (Industrial, Scientific, and Medical frequency band).
It is widely used in consumer electronics, wireless mice/keyboards, remote controls, and toy applications due to its high integration level and minimal external component requirements. yl105 datasheet
The YL105 is a single-channel, opto-isolated relay module designed for interfacing with 5V logic systems. It allows a low-voltage microcontroller to switch an external circuit operating at high voltage (e.g., 110V AC or 220V AC) or high current (e.g., 10A at 30V DC). 10A at 30V DC).