Rolton K600 7.4V Bluetooth Wireless Audio Speaker Megaphone Voice Amplifier With Transmitter 1. K600 wireless version of the amplifier, no button, can not insert the card, can not be inserted into the U disk playback, only the amplifier function 2. The wireless function of the machine is achieved through the transmitter, the transmitter frequency is 92, the loudspeaker switch to FM mode, the transmitter is automatically paired successfully after the power on. 3. Easy to wear, can be buckled in the belt or pants on the edge of the belt can also be used to hang waist belt, can be freely adjusted 4. Bluetooth 5.0, compatible with the connection of mainstream devices, such as cell phones, computers, laptops, tablets, etc. 5. 7.4V high voltage, loud and high power 6. Double voice coil thou iron boron speaker double MOS tube double voltage, covering an indoor area of 2000 square meters 7. Intelligent noise reduction, restore fidelity sound quality 8. The whole machine a knob to adjust the switch volume mode, simple operation Parameters: 1. Rate power: 10W 2. Material: plastic 3. Microphone output interface: 3.5mm 4. Voltage: DC3.7V - 7.4V 5. Battery capacity: 3000 mAh lithium 6. Weight: 149g 7. Size: 90 x 39.2 x 109.5mm Product standard equipment: Amplifier x 1 Headset wired microphone x 1 Belt x 1 USB charging cable x 1 Microphone cover x 2 Separate transmitter x 1