Features: Powerful Microphone and Speaker:  The portable voice amplifier is equipped with a wireless headset microphone. UHF wireless transmission technology can realize a stable wireless connection of 20m or 65ft in an open area. The UHF wireless headset makes your voice louder and clearer when walking around the room. Super 5W output, the sound covers an area of 10,000 square feet (1,000 square meters), perfect for 20 to 100 people. Suitable for medium or small rooms.  Rechargeable Headset Speaker: Built-in lithium-ion battery (3500mAh) can last up to 21 hours. The music playback time is up to 10 hours. It only takes 3 to 4 hours to fully charge. But the wireless microphone can only be used for 2-4 hours. The battery life of wireless headset is short. If you need to use the item for a long time, we recommend that you choose the wired version.  All-in-one Voice Amplifier:  Bluetooth speaker or Bluetooth voice amplifier supports microphone input and music playback or supports TF card and recording functions.  Compact size: measures about 126mm (height) x 86mm (width) x 36mm (thickness) or 4.96x3.39x1.42inch, lightweight (about 250g). IPX5 waterproof voice amplifier adopts durable ABS material to ensure the shockproof and waterproof performance of the amplifier. Even if you accidentally drop it on the ground, you do not have to worry about it being damaged. (Note: the headset microphone is not waterproof)    Warm Tips: 1. The voice amplifier cannot be immersed in water, and the microphone is not waterproof 2. When using the voice amplifier, please charge it first, and then keep a proper distance between the speaker and the microphone to avoid making noise.  3. Only the power amplifier speaker has a built-in Bluetooth function. The wireless headset is not a Bluetooth microphone.      Specifications: Bluetooth: 5.0   Maxi power: 5W   Charging input: 5V-2A   Bluetooth device name: K7   Speaker: 2.5 inch strong magnetic full frequency   Battery: 3.7V 2000mA   Output power: 5Wx1 RMS   Frequency response: 150Hz-20KHz   Signal to noise ratio: ≥75dB   Product size: about 126x86x36mm or 4.96x3.39x1.42inch   Net weight: about 250g   Color: black, white      Packing List: 1 x Amplifier   1 x UHF Headset   1 x 3.5mm Wired Headset   1 x Manual   2 x Charging Cable