adds 2 channels of gain to line level inputs (useful for some receivers). Allows access to busses to add 2 more channels to mixer. Pip is a power supply small enough to fit inside a windshield. Mini Papi is extremely small pre amp with phantom power.
Remote Audio has a studio record light and bell system - when you need to tell the people off set that you're shooting then this bell and light system is invaluable. Several can be chained together even wireless link for security at the gate.