LINEAR Garage Door Openers LBT/MINI-T Mini Remote Control Ladybug 310MHz 1-Button "Ladybug" Mini Key-Chain garage door opener remote control. Compatible with all Delta 3 system products by Linear 310 MHz frequency. 8 switch code setting. Battery, and instructions included. Dimensions 2 1/8" x 1 3/8" x 1/2 Inch.