... Welcom OEM/ODM!mini speakers with TF Bluetooth portable speaker Production Features and Description: Model.No.K10U MaterialABS ... Frequency response80HZ-18KHZDistortion < 2% Li-ion Capacity400mAhProduct Size55*55*57mmNet Weight172g/pcColorsRed, Blue, Silver,Black, Orange, GreenPackaging50pcs ... beep " sound, means that mobile phone connected with speaker successful. 5)All match process just need 1 minute ...