Listen Technologies LP-4VP-072-01 72MHz DSP Value PackageStart your assistive listening setup affordably with the LP 4VP 072 Assistive Listening DSP Value Package. Meeting the basic assistive listening needs for classrooms, theaters, business meetings, training sessions, and more, the LP 4VP 072 includes our LT 803 stationary transmitter, four LR 3200 072 receivers, a 90 degree helical antenna, earbuds, and a signage kit for full compliance in a basic system.