LINEAR GT30 LINEAR GT-30 VISOR MOUNT TRANS GT-30 3-channel Genie Compatible Visor Transmitter 3 buttons and 3 channels to operate three independent gate, garage, and/or other access operations. Test/operate LED. Black case color. Molded design to comfortably fit the hand. Easy access to battery compartment. Anti-code-theft, rolling code technology. Visor clip supplied. Power: Two CR2016 lithium batteries. Frequency: 390 MHz.