1. Equipment: 7.4v 2600mAh rechargeable lithium ion battery for Canon NP-E6/E6N； 2. Function buttons: including auxiliary shutter release button, auto focus start button, auto focus point selection, AE lock/FE lock button, multi-function button and main button dial； 3. Compatibility: The battery grip is compatible with Cano n EOS 5D mark Ⅲ/5DS/5DSR camera； 4. Portability: easy to carry when going out; fast charge and keep charged, no need to worry about insufficient power when shooting。 For Canon EOS 5D mark Ⅲ/5DS/5DSR camera vertical battery grip, used to replace Cano n NP-E6/E6N 7.4v 2600mAh rechargeable lithium-ion battery。Size and weight：153*85*93mm ， 380g。