Tired of honking through the battery box for your regular stage shows?
If you're running Sennheiser D1 systems, then make sure you fit them with rechargeable battery packs (BA10 for handheld, BA30 for bodypack).
Then all you need to do, in between performances, is place two handheld transmitters, or two bodypack transmitters (or one of each) into the CHG2 charging station, and it'll take care of the rest for you.