Works perfect as cap Free size Rechargeable Bluetooth Speaker Enjoy music by keeping yourself warm Happy Winter V3.0+EDR Bluetooth version, available for most of devices with Bluetooth function. Elastic knitted material, warm, soft and stylish design. Protects you from cold winter and will also 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. Built-in Li-ion chargeable battery, charge via USB cable, long stand-by time. Specifications: Bluetooth Version: V3.0 Frequency: 2.0Hz-20kHz Transmission distance: 10M Transmission distance of MIC: ≤1M Li-ion Battery:180mAh Charging time:2 Hours Continuous talking time: 4-6Hrs Bluetooth music play time: 3-6H Brand No Brand SKU 100229030_NP-1020491024 Model c