Caldwell E-Max Pro Link Bluetooth Communication Link Black. The E-MAX Link pairs to your current hearing protection wirelessly via Bluetooth with compatible muffs or plugs or with a 3.5mm audio cord for non-Bluetooth hearing protection. Included is a rechargeable battery (optional 3xAA use) with a USB-C charging cord. In the field or on the range communicating with others has never been easier Use the Link with any Caldwell hearing protection including E-MAX Comms Power Cords E-MAX PRO E-MAX PRO BTs E-MAX Shadows and E-MAX Shadows Pro. Specifications for Caldwell E-Max Pro Link: Manufacturer: Caldwell Color: Black Battery Type: Lithium Ion Quantity: 1 Interface: Bluetooth Features of Caldwell E-Max Pro Link CONNECTS VIA BLUETOOTH TO HEARING PROTECTION ALLOWS COMMUNICATION BETWEEN MULTIPLE USERS COMPATIBLE WITH SHADOWS POWER CORDS PRO BT AND OTHER BLUETOOTH HEARING PROTECTION Package Contents: Caldwell E-Max Pro Link Caldwell 1142645: E-Max Pro Link Bluetooth Communication Link Black