Number of channels: 1/4 Battery: 12V 23A Installation: wireless Wireless transmission distance: 50-150 m (open space) Frequency: MAHS40 40.685MHz red buttons Only compatible with MAHS40 40.685MHz for MAHS40-01 Purchase tips: Check the frequency on the back of the remote control; it must be 40.685MHz Check the color of the button, which is red Check the model number of the remote control, which is MAHS40-01 Programming manual: The transmitter and receiver must be coded to match each other 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 specifications to ensure compatibility Product may vary slightly due to batch differences; such variations do not affect functionality Color: as shown in photo Material: plastic Package contents: 1 x Garage door remote control Only the above package content; other items not included Note: Lighting and display settings may cause slight color differences between image and actual item Measurement error allowance: +/- 1-3 cm