1、With high volume and low feedback features, the output power is 5W, suitable for teachers, fitness coaches. 2、Large battery capacity with long service life and strong endurance, no more worry about lacking of electricity. 3、The voice is transferred to the device by using an auxiliary port, supports playing memory cards, USB flash drives and FM radios. 4、Light in weight, and can be easily worn on the waist or hung around the neck by using the complimentary belt. 5、No need to worry about pairing or connectivity, plug and play, provide convenient using experience. Item Type: Portable Voice Amplifier Material: ABS Weight: Approx. 310g/ 10.9oz Rated Power: 5W Separation Degree: 80dB Distortion: 1% (3.7V, 1kHz, 1W) Operating Voltage: DC3.7V Charging Voltage: DC5.0V Battery: 1PCS 2200mAh lithium battery (shipping with battery) Display: LED display Bluetooth: 5.0 Speakers: 1 x 2.5 in, 1 x 1.0in Audio Format: MP3/WMA/WAV Operating Temperature: -5°~40° Instruction:1. Put the microphone in front of your mouth for maximum amplification. 2. Keep a certain distance between the microphone and the speaker. You can hang the speaker on your waist. 3. Turn it on and gradually increase the volume as needed. 1 x Voice Amplifier 1 x USB Cable 1 x Belt 1 x Wired Headset Microphone 1 x Instruction