Number of channels: 1/4 Battery: 12V 23A Installation: wireless Wireless transmission distance: 50-150 meters (open space) Frequency: 40.685MHz Button color: red Compatible with model: MAHS40-04 Purchase tips: Check the frequency on the back of the remote control; it must be 40.685MHz. Verify the button color is red and the model number is MAHS40-04. Programming instructions: The transmitter and receiver must be coded to match. Remove the battery cover by sliding it in the direction of the keyring tab. Set the dip switch up or down to match your existing remote control or receiver. Note: Installation guide not included. Professional installation is recommended. Please verify all specifications to ensure compatibility. Product updates may occur across different batches, resulting in slight variations in appearance or color, which do not affect functionality. Color: as shown in photo Material: plastic Package contents: 1 x Garage door remote control Only the items listed above are included; other accessories are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1-3 cm.