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. 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. 3.Built-in microphone:Hands-free amplification and clear callsHands-free call, hands off the steering wheel, driving 4.Built-in TF card slot, support TF card to (ONLY W2 SUPPORTED!!!) Material: Plastic Colour: As Shown Transmission distance: 5-10m Operating temperature: 0-55 Configuration: charging cable/TO connector Bluetooth version: v5.3 Charging port: Type-c port Blue atmosphere light supports TF card reading Support for outputt Built-in battery (120mAh) Bluetooth frequency: 2.4 - 2.4835GHz Model number: W2 Package Contents: 1x audio Bluetooth adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.