The Listen LR-44 Lanyard 4-Channel IR Receiver is comfortably worn around the neck and earphones are plugged into the receiver. The receiver can receive up to four channels in mono or stereo. It uses standard AAA alkaline batteries for more than 30 hours of use, or a NiMH rechargeable battery pack that delivers 15 hours per charge. The unit features auto shut-off after 30 minutes of no carrier, further extending battery life. The LR-44 boasts high performance audio specs in a small package and is compatible with other manufacturers' products. The LR-44 is used for government compliance (such as ADA), assistive listening, language interpretation, live theatre, houses of worship, courtrooms, secure rooms and for auditory description.