Product Features : Product Name : KTV Function Bluetooth Speaker. Model : MY220BT. Bluetooth Version : JL 2.1 4601. Wireless Distance : 10M. KTV Function : Support Most of KTV App (IOS System may not Support). Call Functions : Support For Bluetooth Hands Free Talking. Product Channel : 2.0 Stereo. Speaker Specifications : 40*2 + 4070MM Low-Frequency Radiation. Horn Impedance : 4 Ohm. Speaker Power : 4.5W. Max Output Power : 9W. Distortion : 3%. Frequency Range : 80Hz - 18 Khz. USB Sound Card : USB 2.0. FM Frequency : 87.5MHz - 108MHz. Audio Jet : 3.5MM. Maximum Support Memory Capacity : 32GB. Audio Format : WAV/FLAC/MP3. Battery Capacity : 3.7V /2000MAH. Playing Time : Medium Volume 10 Hours. Charging Power Supply : 5V/1.5A. Charging Time : 2H. Made in China.