Super Compact Design makes the beltpack the industry’s lightest, rechargeable Lithium-Ion Batteries provide up to 20 hours of beltpack operation with each charge. Internal Antennas are housed inside the beltpac for extra protection and durability. Voice Prompts inform users of status changes and system diagnostics through the headset, such as “low battery.” Completely Sealed Buttons dramatically enhance the life of the beltpack by keeping dirt and moisture out and preventing mechanical failures.