Description Descriptions: V5.0 Bluetooth Version: available for most of devices with Bluetooth function. Material: Elastic knitted material, warm, soft and stylish design. Cold Winter: Protects you from cold winter and allow you to listen to music and talk while doing variety of other activities. Built-in Microphone: Available for cell phone to transmit the speaking phone to your audio devices directly, hands-free answering. USB Rechargeable: Built-in rechargeable battery, charge via USB cable, long stand-by time. Removable Headphone: Headphone can be taken off so that you can wash the hat. Application: Perfect for traveling, waiting for the bus, jogging in the cold or just rocking out in your bedroom. Specifications: Type: Bluetooth Beanie Gender: Unisex Material: Acrylic Fiber, Polyester Color: Black, Grey Head Circumference: About 56-60cm/22.05-23.62inch Bluetooth Version: V5.0 Frequency: 2.4026GHz-2.480GHz Transmission Distance: About 10m / 32.80ft Transmission Distance of Mic:1m / 3.28ft Frequency Response: 85db Battery: 3.7V/200mA battery(built in) Charging Time: About2 hours Number of Charge: > 1000 times Charging Voltage: DC 5V Standby Time: About 60 hours or so Continuous Working Time: About 6 hours Bluetooth Name: Bluetooth Hat/Call me (you may search one of them) User tips: The music Bluetooth hat is designed to be reused and it is washable. Therefor the icon panel on the hat is not fixed to the buttons. If you the icons do not match the control buttons, please manually adjust them. The control panel is perfectly positioned if you see full indication light from the light window. Press the ON/OFF button for 2.5seconds, the device is open once "BLUE" LED slowly flash. Press 2.5 seconds again, device close. Due to different Bluetooth module, you may search one of the Bluetooth name: "Bluetooth Hat", "Call me" on the Bluetooth device list of your smart phone, no password needed. Make sure you enable both call audio and media audio on your Bluetooth set up menu on your phone. You might have to manually adjust the hat to find the Micro USB charging port because the Bluetooth hat is washable. Package Included: 1pc x Bluetooth Beanie 1pc x Neck Tube 1pc x USB Cable Note: 1. Due to the light difference, the items color may be slightly different from the pictures. 2. Please allow slight deviation for the measurement data and make sure you do not mind before ordering.