The LA-362 Rechargeable AA NiMH Batteries are specifically designed for use with Listen Technologies’ discontinued legacy belt pack devices. These batteries provide an extended life, allowing for hundreds of recharges without any loss in capacity, ensuring you have a dependable power source for years to come. Their compatibility with Listen Technologies’ drop-in charging cases further enhances convenience, making it easy to keep your batteries charged and ready for use. Please note that the LA-362 batteries are not compatible with iDSP receivers (LR-3200, LR-4200, LR-5200 receivers), so ensure you check device compatibility before purchasing. Trust the LA-362 for reliable, long-lasting power in your audio equipment.