New ModelsEASY TO USE: Just plug it into the 3.5mm jack of your stereo device and pair it with your phone via Bluetooth (NOTE: Only DC 5V USB power adapter or 5V car charger are supported).Hands-free: With the built-in microphone, you can easily answer calls, allowing you to drive safely. Detachable design, easy to use.Bluetooth 5.0: Bluetooth 5.0 technology can not only provide faster and more stable device connection, but also ensure high-quality sound and provide good performance within a 50-foot operating range.Product Model: C28 Bluetooth Audio Receiver and Transmitter 2-in-1Product color: blackProduct weight: 39g (color box, including: host, charging cable, 3.5 audio head, manual)Package size: 103*68*18.3mm Battery capacity: 140AmhCompatible type: computer, TV, projector (transmitting mode) / car, speaker, earphone (receiving mode)