Specification: Material: ABS Color: Silver gray Transmission distance: 5-10m Operating temperature: 0-55℃ Configuration: charging cable or TO connector Bluetooth version: v5.3 Charging port: Type-c port supports: TF card reading(W2) Built-in battery: (120mAh) Playback time: about 6 hours Bluetooth frequency: 2.4 - 2.4835GHz Model number: W2 or W1 Size: 4.6×3.2×1.5cm Note: This link has two products you can choose to buy, W1 does not support TF cards! Only W2 supports!! Please choose the product you really need before you buy!!! Features: 1. Bluetooth compatible: This audio Bluetooth adapter support 3.5mm aux audio, and also compatible with most smartphones, bluetooth audio devices, and stereo equipment with audio input port. 2. Wireless Car Receiver: Say goodbye to tangled wires and enjoy the freedom of wireless connectivity with this car receiver. 3. 3.5mm AUX Input: Connect your phone or other devices with a 3.5mm audio jack to this adapter, allowing you to play music through your car's speakers. 4. Clear sound: Gets high-quality audio sound with good performance, gives you a good experience when answering the phone or watching late-night shows. In order to get clear sound, we recommend NOT using the 3.5mm Bluetooth transmitter-receiver while charging. 5. Built-in microphone: Hands-free amplification and clear calls Hands-free call, hands off the steering wheel, driving safer. Package Includes: 1 x AUX Bluetooth Adapter Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.