Philippines

<div><p>Speaker With:4-8ohms  recommended:4 ohms
Size:21 x 18 x 3.4mm(L x W x H)
Application:LCD TVs, monitors,Laptop,Portable Speakers,DVD players, Game consoles,Phone / speakerphone
Operating voltage: 2.5V-5.5V
Net weight:1g
Speaker Power :2-8W
Color:As the pics show
Package include:5 x amplifier board
Can use the computer USB port 5V power supply
or using a mobile phone charger USB port 5V power supply
battery power can also be used
high efficiency:90%
can provide 3W (left channel) +3 W (right channel) output power in the 4 load and 5V power supply conditions
A class, B class amplifier such efficiency is only about 30%
D class amplifier is highly respected today 
D class amplifier efficiency is high, not because of temperature affect the sound quality
but do not add heat sink and take less space
noise canceling circuit was built in the amplifier board
power on / off without noise
module has a short-circuit current protection and over-temperature protection</p></div>