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Description:OT-B588: 1) Technology: Bluetooth V1.2 compliant (compatible with Bluetooth 1.1) 2) Talk time: up to 6 hours 3) Standby time: up to 6 days 4) Broadcasting range of 10m (30 inches) 5) Weight: about 18g 6) Chipset: CSR 7) Radio performance: Class II 8) Bluetooth wireless connection, getting out of the trouble with surrounding you for line-control headset, so it's more convenient to communicate 9) You can adjust the ear hook, and appreciate the flexible, soft-touch headset that delivers a comfortable fit on either ear 10) Fashionable appearance, smart model portable 11) With volume control button 12) Especially designed Bluetooth indicator, which is very noble 13) Takes advantage of the noise-canceling microphone to get great sound from noisy environments 14) One-year limited warranty OT-B688: 1) Technology: Bluetooth V1.2 compliant (compatible with Bluetooth 1.1) 2) Talk time: up to five hours 3) Standby time: up to five days 4) Broadcasting range of 10m (30 inches) 5) Weight: about 17g 6) Chipset: CSR 7) Radio performance: Class II 8) Eliminates tangled wires and cord clutter forever 9) Fashionable appearance, smart model portable 10) With volume control button 11) Uses it wirelessly with your Bluetooth mobile phone - compatible with all major brands 12) Noise-canceling microphone to get great sound OT-B718: 1) Bluetooth technology, compliant with Bluetooth specification V1.1 2) Environment, operating temperature: -20°C to 60°C 3) The least volume, dimensions: 60 x 18 x 11mm 4) Lightest weight, only 10.8g 5) Standby time: a week 6) Standby time: up to 168 hours 7) Super low radiation 8) Super compatibility, so that when changing cell phones, there is no need to change headset 9) Beautiful style, according to the streamline style designed by human body engineering, delicate craftsmanship, suitable for the wearing of different people 10) Comfortable wearing, no feeling of crashing down and oppressing, it can be worn for a long time OT-B738: 1) Technology: Bluetooth V1.2 compliant (compatible with Bluetooth 1.1) 2) Talk time: up to 5.5 hours 3) Standby time: up to 5 days 4) Broadcasting range of 10m (30 inches) 5) Weight: about 20g 6) Chipset: CSR 7) Radio performance: Class II 8) A wireless headset based on Bluetooth technology 9) Specially designed for different kinds of Bluetooth cell phones 10) Fashion type similar as international famous brand 11) Fair-sounding voice similar as classical soft music 12) Convenient hand-free service which makes your hands out of picking up phone while driving and working, out of radiant harm while phoning