The new XP model DSLR cables are the most versatile cables on the market. The XP model cables can be used with a Switronix accessory or used solo with a PRO-X series lithium-ion battery product. The cables features a regulated 7.9v LP-E8 type battery connection for the Canon T2i, T3i and T3 camera's battery compartment. The XP-DSLR-T2i includes both red and green LED indication to display status of battery power. No additional adapter/cable required.