Item Type: Mini Amplifier Board <br>Material: PCB <br>Power Connector: Micro 5p (Reserved for 2.5mm/0.10in Solder Port) <br>Input Voltage: 3.7V-5V <br>Amplifier Operating Mode: Switchable Class AB and Class D <br>ANR: 90DB <br>THD and N: -70DB <br>Crosstalk: -86db <br>DNR: 91db <br>Output Interface: <br>Speaker output port x 2 groups (left and right channel each group), recommended to connect 4Ω 5W-50W power speakers to use <br>Users can freely switch CLASS AB or CLASS D working mode according to sound preference and power matching. <br>Product Features: <br>Power switch and volume knob integration, the sound is adjusted to the smallest counterclockwise rotation, hear the click sound that is off, clockwise rotation that is on <br>Product Use: <br>Cell phones, laptops, tablets, sound signals through the 3.5mm sound cable connected to the stereo amplifier output1、Button Control: Stereo mini amplifier board, high transmission effect and stability, with button control, convenient to control volume up and down, switch on and off, etc. <br>2、Power Supply: This mini amplifier board uses micro 5p interface power supply, ordinary cell phone charger 5V 2A charging cable can be used (not included), convenient and fast. <br>3、Output Interface: Amplifier module has two sets of speaker output ports (one for left and one for right channel), and it is recommended to connect 4 ohms 5W?50W speakers. <br>4、Working Mode Switching: Professional amplifier module, can freely switch CLASS AB or CLASS D working mode according to sound preference and power matching. <br>5、Easy To Use: Integrated power switch and volume knob, when the sound is adjusted to the minimum turn counterclockwise and hear the click sound that is off, turn clockwise to turn on. 6、Applications: Sound power amplifier board device to adjust the volume through the switch, ideal for DIY speakers. Be widely used in store solicitation, home theater, speakers, etc.1 x&nbsp;Mini Amplifier Board