The Varizoom D-4200 Digital Battery Watch is a device for testing the status and power of digital batteries featuring the 3-Stud or V-Lock mounting system. It displays information on an LCD and allows the user to check a battery that does not have a readout.
BackLit
This unit has a back light function offering an easy to read display readout.
Off Battery Information
Varizoom chooses to offer it's readout off of the battery for cost and space saving functionality.