ISOtunes Sport OPMOD CALIBER True Wireless Tactical Earbuds w/ Bluetooth 25 NRR Wolf Gray Universal. The Protection You Need. CALIBER is a Bluetooth shooting earbud that packs a big punch in a little package. This electronic Ear Protection is completely dust sweat and waterproof and can run up to 13 hours without needing to be recharged. The completely cordless design allows you to move freely while Tactical Sound Control delivers amplified natural sound and gunshot noise reduction. Specifications for ISOtunes Sport CALIBER BT Tactical Earbuds with True Wireless Bluetooth 25 NRR: Manufacturer: ISOtunes Sport NRR: 25 dB Quantity: 1 Size: Universal Fabric/Material: Silicone Package Type: Box Included Accessories: Standard Condition: New Features of ISOtunes Sport CALIBER BT Tactical Earbuds with True Wireless Bluetooth 25 NRR: Tactical Sound Control Technology; SafeMax Technology; True Wireless; 2 Hr Auto Power Off; Background Noise-Reducing Microphone; IP67 durability rating Package Contents: ISOtunes Sport CALIBER BT Tactical Earbuds with True Wireless Bluetooth 25 NRR (x3) Pairs of Short TRILOGYTM Foam eartips in 3 sizes (S/M/L) (x3) Pairs of TRILOGYTM Foam eartips in 3 sizes (S/M/L) Pair of Silicone triple flange eartips Charging case with lanyard USB-C charging cable OPMOD IT-17OPGR-KIT2023: ISOtunes Sport OPMOD CALIBER True Wireless Tactical Earbuds w/ Bluetooth 25 NRR Wolf Gray Universal