How many batteries are required for each receiver?
Two (2) AAA batteries are required.

How many hours will my receivers operate on a set of batteries?
While this number varies based on use and volume selected on receiver, generally the battery pack will last 15 hours.

Can I only charge my battery pack in the receivers?
No, you can also charge them externally in the charging station allowing you to have back-ups if you so choose.

Can I use non-Listen NiMH re-chargeable batteries with the LR-42 and LR-44?
No, if using NiMH re-chargeable batteries, you will need to use the LA-364 battery pack from Listen.