The LA-364 IR NiMH Rechargeable Battery Pack is used with the LR-42 and LR-44 receivers, and offers the user the ability to use the pack to power Listen IR Receivers. The battery pack can be charged using the LA-350 8-unit IR Charging/Storage Station either in the receivers, or as back-up packs in the charging station. The LA-364 pack offers the user up to 15 hours of receiver operation before needing to be recharged.