MULTI-CODE 4200 Garage Door Opener Keyless Entry 300MHz Wireless Keyless Entry System. Tamper Resistant and Weather Proof. 300 MHZ frequency. 10 switch code setting. 12 button, alphanumeric keypad. Back lit keypad. 4-digit PIN code access. Dimensions 2 3/4" x 6 1/4" x 1 inch. Easy mounting. Battery, mounting screws and instructions included.