Extra xFOB for your MOB+ Wireless Kill SwitchIntelligent Man-Over-Board SystemMOB+ xFOB is the heart of the MOB+ Wireless Cut-Off Switch. Such a small device, but packed with wireless technology ï¾ it is groundbreaking.The xFOB weighs in at only 10 grams and is only 1.74″ long. With the Universal Fit design, it can fit inside the xTAG, xBAND or in your pocket. The MOB+ xTAG can be worn around your neck, or attached to your life vest and garment with the standard lash tab Clip-on. With the xFOB you can virtually use the MOB+ Wireless Cut-Off Switch in any thinkable way.