It's a DC 12V Single Channel Relay Module RF Wireless Switch Receiver + Remote Control Transmitter DIY Kit 433mhz.

1. A great replacement for door open button or other switches of devices, widely used in elevating controller, automobile, household appliances, machine tools, alarm system and other automatic control area.
2. An automatic switch for automatic regulation, with self-lock function, allows safety protection and circuit conversion.
3. 315/ MHz frequency ensure sensitive and strong signal receiving and transmission.
4. High-quality plastic material and professional PCB circuit board, safe without noise and spark, anti-corrosion, moisture-proof and anti-vibration.
5. Equipped with a portable remote control for easy and remote operation.

Specifications:

• Working Voltage: 12V
• Loading Current: 10A
• Frequency: 315/ MHz
•  Size: Approx. 35 x 32 x 19mm/ 1.4 x 1.3 x 0.7in
• Color: White
• Frequency: 315/ MHz
• Button: 1 Button
• Battery: 2016 Button Battery
• Size: Approx. 35 x 60 x 9mm/ 1.4 x 2.4 x 0.4in
• Package Size: Approx. 90 x 80 x 30mm / 3.5 x 3.1 x 1.2in
• Package Weight: 42g

Package List:

1 * Wireless Circuit Board Relay Receiver

1 * Remote Control Transmitter 

Control Mode:

1). Self-Lock Mode: Press->On; Press again->Off (Need 1 channel switch and 1 remote control button.)

Press one button for working/ ON. Press the same button again for stopping/ OFF.

2). Inter-Lock Mode: Press->On; Press other button->Off (Need 1 channel switch and 2 remote control buttons.)

Press one button for working/ ON, press another button for stopping/ OFF.

3). Jog Mode: Press and hold->On; Release->Off (Need 1 channel switch and 1 remote control button.)

Keep pressing one button for working/ ON. Remove your finger for stopping/ OFF.