Model bt s100 Standard bluetooth v1.2( class ii ) Frequency 2.4ghz~2.48ghz ism band Operation range up to 10 meters (33 feet) Data rate 723 kbps Sensitivity -80dbm@0.1%ber Rf tx power 0 dbm Connectivity point to point Audio codec 15 bits resolution, s/n>90db Audio encryption 128bits Battery rechargeable li-ion polymer 900mah Low battery warning warning beep & led Talk time 10 hours Stand by time 900 hours Charger 5v dc, 110 - 240v ac adapter with 4-pin miniusb interface, Or 12/24v car charger Charge interface 4-pin mini usb Storage temperature -40-85f¦ Dimension 77g including battery Certifications bqb, fcc, ce