LTK5328 5Wx2 Stereo Amplifier Board Dual Channel Digital Audio Amplifier Module 5V Class D/AB Amplifier ?Output interface: speaker output port x 2 groups (one group for left and right channels),it is recommended to connect 4 ohm 5W-50W power speakers for use ?Users can freely switch between CLASS AB or CLASS D working modes according to sound preference and power collocation ?The power switch and the volume knob are integrated. When the sound is adjusted to the minimum,turn it counterclockwise. When you hear a clicking sound,it is turned off. Turn clockwise to turn it on ?Powered by a Micro 5p interface,an ordinary mobile phone charger 5V 2A charging cable can be used ?The audio signals of mobile phones,laptops,and tablets can be connected to the output of the stereo power amplifier through a 3.5mm audio cable ?The power switch and the volume knob are integrated. When the sound is adjusted to the minimum,turn it counterclockwise. When you hear a clicking sound,it is turned off. Turn clockwise to turn it on ?Specifications: ?Product name: LTK5328 Stereo Power Amplifier Board ?Product size: 54 x 33 x 15mm ?Product parameters: 4|?2x5W ?Power interface: Micro 5p (reserved 2.5mm welding port) ?Input voltage: 3.7V-5V ?Amplifier working mode: switchable class AB and class D ?Signal-to-noise ratio: 90db ?THD+N:-70db ?Crosstalk: -86db ?DNR: 91db Package included: ?1 x Stereo Amplifier Board ?1 x 0.7m USB Power Cable ?1 x 1m 3.5mm Audio Cable ?1 x Chinese Manual