Bluetrek Crescendo Voice High Noise Cancellation Voice Controlled Bluetooth Headset - Rubber Black Accurately Recognizes Voice Commands Talk2Me Feature-Voice Control Lets User Pair, Check Battery, Check Voicemail, Call Favorites And More Bing411 Voice Search Engine Offers Direct Access To News, Weather, Flight Schedules, Stock Information And More Dial Bluetooth V2.0 (V2.1 Compatible). 9.1 grams. Up to 5 hrs of talk time and 7 days of standby Fashion black gloss finishing with rubber black casing. Dual mic and proprietary Crystalline Voice Technology, cancel 90% of unwanted background noise. Voice control feature allows you to control the headset by command of your voice with no voice training required. For example, Call voice mail, Call home, Call office. Built-in Free service like Bing voice search and 511 local traffic condition hotline. USB cable, USB vehicle power adaptor included.