PL1K3 Portable Hearing Loop Kit (PL1 Amp and Robust Case)The PL1 is a compact audio frequency induction loop amplifier capable of generating a loop listening field of more than 100mA M (the level required by BS 7594: The code of practice for audio frequency induction loop systems) at distances greater than 1m from the unit itself. Suitable for counter, table or desktop use, it is ideal for restricted person to person contact in areas such as banks, post offices, small meeting rooms, reception desks, open