Capable of charging 45 transponders, the bulk charger is also a convenient carrying case made from a tough Mil-Spec, IP-67 case. Typical charge time is ~ 3 hour when full of transponders. LED lights on the transponder indicate full charge while in the charging case. When removed from the case the transponder green LED indicates approximate number of days of battery life left (up to 7 days). A red LED indicates when the transponder charge has less than 1 day remaining. SUPPORTS ORIGINAL RECHARGEABLE TRANSPONDERS ONLY.