Features: brand new and high quality brand new and high quality Easy To Operate: Simply connect your speaker with our device, immediately transform your speakers into a fashionable wireless BT speaker. Wireless Play: Removing troubles of wired connection, through the wireless connection and transmission ,enjoy a for high fidelity music at any place indoor by wireless control. Portable design: with mini size ,the feature of portable can let you carry them to anywhere you want. Lossless High-quality Sound Quality Presentation: The latest RDA solution technology, the device and speakers are connected via BT, without loss of sound quality. Let you enjoy the most original high-quality music. Hands-free Answering of High-definition Calls: Built-in microphone, the phone is connected to Bt and transmitted to the car audio, hands-free amplification, high-definition calls, hands are kept from the steering wheel, driving is safer. Specifications: Working voltage: USB for DC 5V Output interface: 3.5mm BT version: BT 5.0 Effective distance: about 10 meters TF card: ≤32G Material: zinc alloy + TPU wire Spring cord length: 30-100cm Material: ABS Color: Dark Gray Net Weight: 25g/0.06lbs Package Includes: 1x Wireless Audio Transmitter note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.