What is the main funciton?
1. Mini Portable Amplifier 15W.
2. Support SD and USB Multifunctional Voice out
3. Surport voice recorder, CD/VCE/MP3/Mobile and other sound equipment.
4. For tirp calling, portable take on for the guider.

More specificaiton:
Power: 15W
Frequency response: 50-10000Hz
Current Consumption: 150mA
Voltage: DC 9V Li battery
Charger time: 7-8 hours
Dimension: 105*85*45mm
Weight: 320g

ABS engineering plastics, it is not afraid of the impact, clear sound.
8-15 hours of continuous work, battery life can be up to 2-5 years
(Li-ion battery), it can cover 500 square meters with proffional headset microphone.