1) compliant with bluetooth v1.1/1.2 standard 2) bluetooth class 2 3) frequency:2.40ghz-2.480ghz 4) channels:79 5) standby time (max. ):200 hours 6) talk time (max. ):6 hours 7) battery: Rechargeable li-polymer 8) operating distance:10 meters (outdoor) 9) simple touch call reject, call waiting, voice dialing 10) adjustable volume control key 11) keeps users away from electromagnetic waves caused by mobile phones 12) light and balanced weight design, ensuring comfortable wearing 13) compatible with almost all bluetooth mobile phones and pcs 14) incoming call number display optional (lcm, oled display) 15) incoming call vibrating alert optional 16) incoming call music alert optional compatible with: Blackberry, i-mate, motorola, NEC, Nokia, o2, panasonic, sagem, samsung, sharp, siemens, Sony ericsson, t-mobile etc...