Marrex MX-G10 GPS Receiver for Canon EOS Digital Rebel T5i, T5, T4i, SL1, EOS-M, M2, 70D, 7D, 6D, 5D MK III, 1D-C & 1D-X DSLR Cameras LF475 Build-in Li-ion battery--A build-in rechargeable battery can continuously run for up to 10 hours. When connected to a camera, MX-G10 will not automatically charge itself unless its battery runs out. Fast acquisition--Highly sensitive antenna and upgraded GPS chipset accelerate the satellite searching speed. GPS data-hold--If the GPS signal is lost, MX-G10 will automatically reuse the last valid GPS information for tagging the current photo.