Detects radio frequency and/or infrared emission from key fobs and remote controls. Diagnose faults quickly and easily without the need to dismantle the fob, remote or vehicle. Suitable for a wide variety of vehicle manufacturers. Detects new BMW frequencies. Powered by 9V battery (not included). Model No. VS921. The Sealey VS921 Ir and Rf Key Fob Tester detects and confirms radio frequency and/or infrared emission from key fobs and remote controls. It helps diagnose faults quickly and easily without the need to dismantle the fob, remote or vehicle. It has a magnetic backing that sticks to the side of any ferrous surface for testing the range of the transmitter. Suitable for a wide variety of vehicle manufacturers.