1. DVD PLAYER with SD jack and USB jack.(45 seconds shockproof is optional).
2. 45 seconds shockproof CD/VCD/DVD player, MP3 player, AM/FM radio, 12 radio
  channels can be saved, LCD full screen display.
3. This product can connect with many same portable amplifiers to enlarge the cover
  range; the sound of a single portable amplifier can cover with 500 meters, the range
  is far-flung, its penetrability is strong.
4. The simple build-in storage battery is easy to change and maintenance.
5. Two power supply can be selected: DC power supply outside; 4 units 12V/10A build-in
  storage battery, it is easy for using in the open air, the storage battery can work 5~9
  hours. Charging time of the new storage battery must be 24 hours at least at the first time
6. Two MIC has different frequency; they can be adjusted discretionarily but not interfere
  each other, they are comprehensive selectivity. 
7. Handle wireless mike and wireless emitter can use 9v ordinary battery or 8.4v storage
  battery.
8. with dual frequency receiver and dual wireless MIC. Two people can use wireless
  MIC simultaneously.
9. With oscillatory circuit made of quartz, frequency is steady-going and strong anti-jamming.
10. Digital reverberation, control knob can adjust the effect of the sound, the best effects
  can be achieved if adjust reverberation time according to the need time.
11. The box is made of all wool and a yard wide material, with the particular appearance and
  wears well.
12. Portable amplifier is more suitable for moving inside or outside the door.
 

Specifications:
Power：                   AC~200V-240V50Hz, 
                          DC±12V, build-in 12V/10AHz storage×4
Speaker：                 12 inch woofer , double 5 inch mediant, double alt
Channel：                 Dual frenquency and dual wireless microphone
Range of frequency:   VHF215-265MHz
Sensitivity：              10dBuV(S/Nor up to 60dB)
Size:                      (L*W*H)40.5X30X68cm
Weight:                    33.5Kg
Power output:              220W
Max distortion:            ≤2%