Speakers - Universal - Mini Portable Wireless HiFi Vintage Bluetooth Subwoofer Music Player Gift USB Stereo Bass with Microphone Desktop Rechargeable | Portable Speaker (Black) Highlights Universal Mini Portable Wireless HiFi Vintage Bluetooth Subwoofer Music Player Gift USB Stereo Bass with Microphone Desktop Rechargeable | Portable Speaker (Black) Portable Wireless Mini Subwoofer Retro Bluetooth Speaker Music Player Gift Stereo Bass USB Rechargeable Desktop with Mic | Portable Speakers (Black) Specification: Material: Plastic The color black Size (LXWXH): about 9.5x5.5x7cm/3.74x2x2.75inch Powered by: 1x 400mAh rechargeable battery (built-in) Interface type: USB Frequency: 50Hz-20kHz Output power: 3W SNR ratio: 90DB Impedance: 4 Ohm Bluetooth: 5.0 Effective distance: about 10 meters Support: U Disk, TF card (max 32GB) Charging time: about 2-3 hours Playing time : about 2 hours