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. Check the button color, which should be red. Verify the model number of the remote control is MAHS40-04. Programming instructions: The transmitter and receiver must be synchronized by matching the dip switch settings. 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 between batches. Slight variations in appearance or color may exist and 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 items are not part of the package. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.