Stereo Bluetooth Headset SBH70 Black Features: Water resistant (IP57), Multi-point connectivity, Bluetooth voice-activated dialing, Vibrator, NFC One-touch, Smart memory metal. Battery capacity Standby time: up to 650 hours Talk time: up to 8.5 hours Streaming time: up to 6 hours. Compatibility: Smartphones, tablets, and computers that support at least one of the Bluetooth profiles listed. Acoustics: Speaker type: 14 mm dynamic, Ear coupling: in-ear with increased comfort (vented acoustical design), Frequency response: 35 Hz... 18000 Hz, (diffuse field oriented mid-high range for dynamic and clear audio experience). Max SPL: 100 dBA (EN 50332-1), Total harmonic distortion: &lt;1% (200 Hz...) 8000 Hz @ 100 dBSPL Microphone: ECM (HD voice compliant).