3 in 1 Wirless Transmitter kit which includes the EN-EL3E Battery and MH-18A charger.  Compatible with the Nikon D3, D3x, D300 and D700 cameras.

WT4:

The WT-4 is a high performance Wireless Transmitter for specified Nikon digital SLRs. It supports wired LAN (10BASE-T, 100BASE-TX) and wireless LAN (IEEE802.11b/g, 11a), and enables the creation of multiple camera networks with remote image browsing and download capability. The stand-alone unit can be worn on the waist and enhances the photographer’s ability to shoot without interruption. Remote control of the camera settings and LiveView output is possible with a computer on which Nikon Camera Control Pro 2 software is installed. The WT-4 is powered by a specified Nikon battery, or AC adapter.

MH-18A:

The MH-18a recharges certain Nikon lithium-Ion batteries for use with Nikon’s digital SLR cameras.

EN-EL3E:

The newly developed high-energy EN-EL3e (7.4V, 1,500mAh) rechargeable lithium-ion battery delivers enough power to support the shooting of up to 1,800 images on a single charge, can be recharged at any time and features a handy real-time fuel gauge system display that shows remaining charge by percentage, number of shots since last charge and overall battery status.