Specification:
Specifically designed for Nikon D800 D800E D850.
For use with for Nikon MB-D12/MB-D18 Multi-Power Battery Pack and EN-EL18 Rechargeable Li-ion Battery.
The BL-5 is a battery chamber cover for use when powering the D800/D800/D850 D-SLR with the MB-D12/MB-D18 Battery Pack and using the EN-EL18 rechargeable lithium Ion battery.
Protects the battery chamber when using an external power supply

What's included:
1pcs Battery Chamber Cover