Linear D22C garage door opener Features Contains two eight-position digital coding switches. Two test/operate pushbuttons Test/operate LED Removable wall mounting clip Optional visor clip available - order #210456-01 Standard digital format: 256 selectable codes for each pushbutton Powered by one 9-volt battery (included) Current consumption: 12 mA transmitting RF frequency: 303.875 MHz 2.16"" W x 3.75"" H x 0.88"" D