The Mini-T 1-Channel key ring transmitter is an extremely convenient way to gain access to your garage, security gate or other access point. Measuring just 2.2" tall, 1.42" wide and 0.66" thick, this ultra-small Linear Delta-3 LB Mini-T DNT00026 Ladybug key chain gate or garage door transmitter is barely larger than a pair of quarters. It comes with a key ring and features a test-operate LED light. Powered by a 12-volt battery, this tiny remote transmitter is simple to use and easy to carry wherever you go. The Linear Delta-3 LB Mini-T DNT00026 Ladybug key chain gate or garage door transmitter operates on a 310MHz frequency and features 256 possible codes, which are set by dip switches. It's compatible with any Delta-3 receiver.