OW Headphone Guitar Amplifier Synthesizer with 5 EffectsBuilt-in amplifier could connect earphone or speakers to work independently by D3.5 output, background music of mobile phone can input through the BT receiver, you can play guitar anytime and anywhere .WARM TIPSThe B6 is not a blue tooth transmitter, it is only a receiver, so it can not search BT device and not be used to connect with other BT devices( Such as Bluetooth headphones).The BT function is for playing background music streaming from a smart phone. So you can only use smart phone or Pad to search and connect its blue tooth to play background music.Specifications:Material: ABS Plastic + ElectronStandby Time: 8hCharging Time: 5.5 - 6.5h(Standard Charge); 1.5 - 2.5h(Fast Charge)Charging Method: USB ChargingPower Supply: Built-in rechargeable lithium batteryBT Function: BT receiver for background musicFrequency Response: 50Hz-18kHzInput Impedance:22KohmOutput Impedance:32ohmBlue Tooth Range: 8-10mOutput: 1/8"(3.5mm) Output designed for headphones or speakersInput: 1/4"(6.35mm)Product Size: 4.8 x 0.7 x 1.7 Inch(unfold) 3 x 1.5 x 1.7 Inch(fold)Packing list:1 * Guitar Headphone Amplifier1 * USB Charging Cable1 * D3.5 to D 6.35mm Audio Cable1 * User Manual (6 languages:English,Deutsch,Francais,Espagnol,Italian, Japanese)1 * Protective Cloth Bag