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Specifications: version:3.0 BC5 Battery Battery:Polymer Working :3.3V-4.2V time:8h Time:2.5h speaker power:0.12W Waterproof: IP65 Temperature:-30℃ +60℃ USB 0.5-2A Feature: ☆Waterproof Handles All headset, which used in noisy environment connection, 2 at same in1200 pairing, simple designed installation most open-face free communication etc.