Bluetrek Metal Evolution for iPhone Bluetooth Headset for iPhone 4S, 4 and 3GS - Silver [Retail Packaging] Stylish Bluetooth headset with brushed metallic finish on a reinforced aluminum casing Optimized compatibility and audio tuning for the iPhone Dual NoiseLock microphone technology cancels background noise for crystal-clear conversations Multipoint technology supports simultaneous active connections with two phones Up to 4.5 hours of talk time; up to 120 hours (5 days) of standby time Stylish Bluetooth headset with brushed metallic finish on a reinforced aluminium casing Uses the same Bluetooth chipset at the Apple iPhone for optimum connectivity and compatibility Dual NoiseLock microphone technology- one mic is aimed at your mouth while another picks up background noise Always-on DSP and wind noise cancellation; multi-point technology allows you to use one headset with two phones Up to 4.5 hours of talk time, up to 120 hours (5 days) of standby time