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Product Description True HD high Fidelity sound featuring latest Bluetooth 4.1 CSR technology Battery is increased to provide up to 3-6 hours working time. Circuit design is opertimized to improve performace and reliability. Specifications Bluetooth Specification: V4.1+EDR Standbytime: 110 Hours Battery: rechargeable Lithium-ion Polymer Waterproof with Nano coating Noise Reduction: CVC 6.0 Frequency response: 20 - 22kHz Charge time: about 1.5 hours Support profiles: HFP, HSP, AVRCP and A2DP Package Included 1 x Ear Tips 1 x USB Charging Cable