The PT-20 is a 20" adaptor cable. The PT-20 adapts a 2-pin PowerTap connector to a 4-pin female XLR connector. This allows the on-camera Anton Bauer brick battery to power the original Anton Bauer Ultralight with 4-Pin XLR connector or any 4-pin equipped accessory.

See also: Globalmediapro Gold Mount Batteries & Chargers