Features: The Remote Entry Pro™ is the fastest known method of determining if a remote entry device is functioning properly. It will test Infrared (IR) & Radio Frequencies (RF) of keyless remote entry key fobs and other remote entry devices used by most vehicles. The magnetic back allows easy placement for testing to determine RF effective signal strength. The tester saves the time and inconvenience of hooking up expensive equipment to the passive anti-theft system on many vehicles. It automatically shuts-off to save batteries. The tester is set to function on frequencies between 225 & 322 MHz. This will cover all known makes and models in the US regardless of the vehicles country of origin. Tests IR & RF keyless enty devices - fast & reliable Quickly determines if battery needs replacement - saves needless replacements No need to hookup vehicle to expensive test equipment - saves expensive bay time Magnetic back for placement on tool box - easy to keep track of and helps with strength test. Automatic shut-off - saves internal 9 volt battery