This is a universal 433.92MHz receiver designed to work with most remote controls on the market. It can learn fixed and rolling code 433.92MHz remote controls separately or simultaneously. The 2-channel receiver allows you to control two gate automations or alarm systems at the same time. Specifications: 1. Power supply: 12V-24V DC 2. Frequency: 433.92MHz 3. Compatible with fixed, learning, and rolling code remote controls 4. 2-channel receiver 5. Operating temperature: -40°C to +80°C 6. Built-in antenna with reception range of 10-100 meters Programming Instructions – Momentary Working Mode: 1. Learning a transmitter's code: Press "Learn 1" or "Learn 2" for 1 second until the "Learn_LED" lights up. Press the button on the transmitter until the "Learn_LED" flashes and turns off. The code is now stored. Repeat for additional transmitters. 2. Erasing stored codes: Press and hold "Learn 1" or "Learn 2" until the "Learn_LED" turns off. All stored codes will be erased. Terminal Connections: ANT – Receiver Antenna CH1 – Relay Output 1 CH2 – Relay Output 2 V+ – Voltage + GND – Ground Color: Grey Material: Plastic Package Contents: 1 x Garage Door Receiver Note: Other items shown are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 1-3 cm.