The Model EJ-10 is a multi-input adapter that accepts any input signal line or speaker level input from a variety of audio/video devices, including an analog telephone. It then inserts the signal into an existing PA or music system, while providing the necessary matching and isolation protection for the sound system. includes all audio connections The EJ-10 provides everything required to connect a telephone, VCR, phonograph, tape player, guitar, projector, PC , CD player, DVD player, radio or other audio source, to the microphone input of a PA system. no power supply Virtually any input signal can be accommodated, required including a speaker level input of up to 10 watts. The EJ-10 is a completely passive device, no batteries or external power sources are required for operation. telephone line The EJ-10 features a volume control, RJ-11 modular input capability jacks, phone and phono jacks, a hum switch, and a telephone seize switch. In the telephone line mode, the EJ-10 seizes the telephone line for continuous use. An assortment of interconnect cables and a nylon pouch come attached to the unit. Basic instructions and a block diagram are imprinted on the front panel. A complete instruction manual comes stored inside a pocket of the carrying case.