CALDWELL SHOOTING SUPPLIES E-MAX PRO BT-BLUETOOTH ELECTRONIC HEARING PROTECTION The E-Max Pro BT (Blue Tooth) electronic hearing protection from Caldwell delivers style and comfort for all day use. With a 24dB noise reduction rating and a low profile design, you can stay comfortable and protect your hearing on the range. High quality stereo sound keeps what you want to hear crystal clear and easy to use push button volume controls allow easy adjustments. Runs on a Rechargeable Lithium Battery (included or 3 AA batteries-not included). Mfg: Caldwell Shooting Supplies