2-Button, 3-Channel, Slimline Handheld RF Transmitter Seco-Larm SK-919TP2H-NQ 2 Buttons, 3 channels Operates up to 500ft (150m)* Extreme durability - rubber buttons eliminate damage caused by electrostatic discharge and help make transmitter water resistant. Gold-plated battery clips and contact points extend the life of the transmitter Magic LED only appears when buttons are pressed 315MHz Operating frequency (433.92MHz. also available by request) Over 68 billion possible codes CODEBUMP models also available with 18 quintillion possible codes RF anti-scan protection Includes two 3VDC lithium batteries Compatible with all 315MHz SECO-LARM receivers Visor clip and belt clip included. Belt-clip holster & wall-mount bracket also available (Model SK-9HBC) ​*Actual range will vary greatly depending on the installation and operating environment