Features: Warm and fashion design with Elastic knitted material. 4.1EDR Bluetooth-compatible version, for Universal Models use. Hands-free speaker answering, able to answer phonecalls. Washable Hat, blueteeth module can be taken off. Built-in chargeable battery, charge via USB cable, long lasting time. Enjoy Music enjoy your life more convenient with hat design, keep away from coldness. Perfect for traveling,relaxing, excising or just rocking out in your bedroom. Built-in microphone, available for transmit the speaking phone to your audio devices directly. Notice: Actual color may be slightly different from the image due to different monitor and light effect Please allow 1-3cm deviation due to manual measurement Specification: Material:acrylic fibres Bluetooth-compatible version: 4.1EDR Size:30x21cm Frequency range: 20-20KHZ Sensitivity: 95DM Impedance: 32 ohms Operating range: 10M Speaker size: 32mm Charging time: 2H Listen to the song, call duration: 3-6H Battery: 160-180mA battery Package List: 1x Hat 1x USB Cable 1x Manual