?Portable & 8 Hours Battery Life?The bluetooth transmitter size is small (64*37*12mm, weight 11g) and it is easy to carry. The working time of this aux wireless adapter is up to 8 hours when making calls or playing music. And it takes only 2 hours to fully charge the device. The Product size is small (64*37*12mm, weight 11g) and it is easy to carry. ?Enjoy High quality Wireless Streaming Music?This Bluetooth receiver supports A2DP, AVRCP, HFP, HSP and other audio analysis specifications, adopts CVC noise reduction technology, removes noise, and the sound quality is clearer. Converting non-bluetooth devices to bluetooth devices for wireless connection, suitable for cars, speakers, stereos and headphones. Get yourself freedom from the tangle of audio cables, to enjoy music wherever. ?Bluetooth 5.0 & Stable Connection?Wireless audio adapter has stable connection and fast transmission, to offer better quality wireless audio experience while listening to music or making calls. Wireless Bluetooth Music Receiver maintains a strong connection up to 33ft without obstacles (walls, doors, Wi-Fi routers, Wireless TV adapter, etc.). ?Hands-free Calling & Auto Reconnection?Aux bluetooth adapter, built-in microphone and Multifunction Button to answer / redial / hang up / reject calls. Answer phone calls without picking up the phone. Make you enjoy complete hands-free calling during driving. Bluetooth car adapter can automatically pair with the last connected phone after powered on. Bluetooth 5.0 Music Audio Receiver will enter pairing mode if the Bluetooth of the last phone is unsearchable. ?Bluetooth Transmitter and Receiver ?JXTZ Bluetooth aux adapter can connect to car audio system, home stereo, speaker, and Wired headphone. Using the aux Bluetooth adapter in receive mode, wired devices can play the music that is on your phone; In transmitter mode, Bluetooth devices can receive the sound that on the wired devices.