The kit includes one pair of transmitter and receiver modules. And the frequency is 2.4GHz. There is the MCU on board with built-in encoding and decoding code, pairing code. When you do the remote control operation for the first time, you need to pair the transmitter and receiver, and you do not need to do it again in the future. It is easy to implement remote control without programming. It is very popular for remote control systems, such as wireless doorbell, remote control rolling gates, smart car, smart home, etc.
About the transmitter module (24YK-TX):
- Switch number of channels: 6 channels
- Input ports: 6-channel key input, active low
- Working voltage: 2.5 - 3.6VDC
- Working Current: 0 - 15mA
- Working frequency: 2.4GHz
- Transmission distance: 40 meters (open area)
- Antenna: Built-in PCB antenna

About receiver module (24YK-RX):
- Switch number of channels: 6 channels
- Output port current: 2mA (max)
- Output mode: latch mode or non-latch mode
- Working voltage: 2.5 - 3.6VDC
- Working frequency: 2.4GHz
- Working Current: 23mA
- Sensitivity: -85db
- Antenna: Built-in PCB antenna
- Great for DIY