... testing ,CE certificate,ISO9001:2008 VCOM Professional Multimedia Mini Speaker Product Feature:Frequency:150~18KHz Imdedance:4Ω Imdedance:≤ ... mobile phone Bulit -in rechargeable batterySupport TF card/usb music files automatically play VCOM brand:History:Established in ... , Bluetooth Headphone, Earphone, Speaker, Mouse, keyboard,Game Headphone and Keyboard, Game Mouse, Gamepad, USB Hub,Card Reader, PCI ...