Multi Code 4200, mcs420001 Features Tamper-resistant and Weatherproof, Easy mounting with two screws 12-button, Alphanumeric keypad LED mode indicator Operates with all Multi-Code receivers Power: 9 V battery Codes: 4-digit PIN code access Frequency: 300 MHz (310 MHz also available) Dimensions: 2.75 x 6.25 x 1 inches