Add wireless convenience and value to any DSC security system with the WS4939 

four-button wireless key. Utilizing DSC's unique wireless technology and the latest

 production techniques, the WS4939 incorporates new features and benefits into

 a sleek design that is compact and user-friendly. Users enjoy a sense of control

 over their security systems and the added confidence that comes with portable

 personal protection. The WS4939 four button remote wireless key fob has four 

programmable buttons and offers three optional rubber key configurations to 

cover most applications. The built-in LED tells you when a transmission has been 

sent and with feature controls such as arm and disarm, panic, and garage door

 controls, the fob provides versatility and reliability. The WS4939 can be used to

 arm/disarm security systems from a distance, be programmed to trigger garage 

door openers, turn on lights, open powered gates, or trigger panic alarms. 

A multi-function clip allows the wireless key to be clipped to a convenient location, 

whether it's on a belt or car visor. The WS4939 wireless key is built with reliable 433 MHz technology, uses long-life lithium batteries and is compatible with all current DSC wireless receivers. The WS4939 is compatible with the following receivers: MAXSYS Wireless Receiver 

PC4164-433 PowerSeriesTM Wireless Receivers PC5132-433 and RF5108-433 

Fixed-Message LCD Keypad with Integrated Wireless Receiver, RF5501-433 

EnvoyTM LCD Self-Contained Wireless Security System NT9005