The Caldwell USB Rechargeable Lithium Battery Pack is the perfect accessory for the Caldwell E-Max Pro Electronic Earmuffs or the E-Max Pro with Bluetooth. The Battery Pack is a 3.7V/2.6WH Lithium battery with a simplistic, easy-to-use design, and a USB port for charging. You can never have enough battery on hand so ensure your Caldwell E-Max Pro's always stay charged with the Caldwell USB Rechargeable Lithium Battery Pack.

• For use with Caldwell E-Max Pro/Bluetooth Earmuffs
• USB Charging Port for ease of use
• Simplistic and easy-to-use design
• 3.7V/2.6WH Lithium battery
• Ensure your Caldwell E-Max Pro's stay charged