Convert old audio setups to wireless with ease Turns 3.5 mm wired audio into wireless sound for car audio systems, home audio, and wired earphones or speakers. Compatible with most Bluetooth enabled devices such as smartphones, tablets, laptops, and computers Built in microphone for hands calls. Pair with a Bluetooth device and use the one key to answer, reject, end and redial the last number. Volume up and down buttons for easy on device control Bluetooth 5.0 provides a stable connection with a wireless range of up to 33 ft without obstacles. Automatically reconnects to the last connected device One key to power on and enter pairing mode. Built in battery offers long life and can support up to 16 hours of use after a full charge. Fast charging and a full charge in about 2 hours Use scenarios In car: connect to an older car stereo via the 3.5 mm AUX input to stream music from a phone and take hands calls without wires Home or office: hook up to home speakers or powered speakers to stream audio from a tablet or laptop without sacrificing convenience On the go: use with wired earbuds or headphones to enjoy wireless listening during travel or daily activities while keeping a compact, portable setup