Specifications: Model name: SL-20HW Product description bluetooth stereo headset Color: Black/white Certification: CE, BSMI,FCC Bluetooth version: bluetooth v1.2 specification Rf output: power class 2 Frequency band: 2.4ghz ~ 2.4835ghz unlicensed ISM band Spread spectrum: FHSS (Frequency Hopping Spread Spectrum) Operating range 15 meters (32 feet) Sensitivity: -80dbm 0.1%BER Bluetooth profile headset handsfree, a2dp, avrcp Stereo audio specification: CD-Quality,44.1,48khz 16-bit stereo Audio Codec Standby time: Up to 100 hours Play time: Up to 10 hours Charging time : Up to 3~4 hours for the first time Charging way:Rechargeable Mini USB Bettery: Li-polymer Talking time :Up to 8 hours Audio input: Bluetooth signal LED indicator:Blue Red LED Operation temperature :-10 ~ 55 c Storage temperature -20 ~ 60 c Humidity 10% ~ 90% non-condensing Dimensions 55x30x17mm(l x w x t) Microphone micro phone built-in