Linear DNT00026 1-Channel Key Ring Transmitter, 310 MHz, 12 V Power, 2.2" Width, 1.42" Height Go to amazon.com Related posts 8 best linear garage door remote for 2022 FeatureActivates one Delta-3 receiverTest/operate LEDKey ring suppliedPower: 12 V batteryFrequency: 310 MHz DescriptionMiniature key ring transmitter, black case, white button, key ring supplied, test/operate LED, 256 selectable codes.