it is portable and easy to use.

Feastures:
Portable Amplifier: The powerful voice amplifier and speaker. Unique appearance and light weight. Made of imported ABS and UV materials, it feels good and has good sound quality.
Rechargeable Battery: Built-in 2200 mAh rechargeable lithium battery, the standby time can last for 18-22 hours, and it can be used continuously for more than 12 hours after being fully charged.
Professional Sound Reinforcement Circuit: Built-in DSP five-level mixing system to amplify the sound (reverberation sound). It supports AUX audio input and can be used as a computer speaker.
Multi-functions: Support 32GTF card music player, can directly play MP3, WMA, WAV format audio. FM stereo radio function, automatic search and save radio stations, etc.
Applications: With adjustable belt and detachable belt clip and wired headset microphone, it is suitable for teaching, coaches, singers, training, tour guides, shopping malls and outdoor speeches, etc.

Specifications:
Product Name: Voice Amplifier
Model: K300
Material: ABS/UV
Color: Black, Green, Purple(Optional)
Distortion: 1%(3.7v,1Khz,1W)
Sensitivity: 80db
Impedance: 2 Ω
Signal-to-noise Ratio: ≥75dB
Frequency Response Range: 40Hz-20KHz
Llithium Battery Capacity: 2200mAh
Working Voltage: DC 3.7V
Charging voltage: DC 5.0V
Output power: 5W 
Input Power: Power Adapter/USB/ Li-ion
Display: LED 
Speaker: 2.5 inch
Operating Temperature: -5 ~40℃
Audio Format: MP3/WMA/WAV
Amplifier Size: 11.7*8.6*2.9cm/4.61*3.39*1.14in
Amplifier Weight: 253.5g/8.91oz
Package Size: 17.2*12.5*7cm/6.77*4.92*2.76in
Package Weight: 402.5g/14.20oz

Packing List:
1* Voice Amplifier
1* Wired Microphone Headset
1* Waistband Belt
1* USB Cable
1* User Manual