Features: 1. It can be used in vehicles and home stereos, computers, televisions, etc. 2. To upgrade the equipment without Bluetooth, it is required that the equipment to be converted has a 3.5mm socket, which can be applied. 3. Reject delay, jam, high fidelity, and lossless sound quality. 4. Built-in battery, lasting battery life 5. One-key operation, which can transmit and receive switching. 6. Press the button to start the machine, and the button has an atmosphere light, which can also be operated in the dark. 7. High configuration of components is the core value of the product. Specifications: Size: 5.7*3.3*1.3cm Color: Black Material: ABS Bluetooth: 5.3 + EDR Input voltage: 5V Transmission distance: 10m Battery Capacity: 300mAh Frequency: 2.4 ghz Package includes: 1 x Bluetooth Receiver Transmitter 1 x 3.5mm AUX Adapter 1 x USB Cable