Specification Brand : Wisoqu BulletPoint1 : This is a 2x6W amplifier board with management that can be powered by lithium battery. BulletPoint2 : Small heat production in standby, good stereo quality, suitable for small speakers. BulletPoint3 : Output power 6W+6W, channel stereo. BulletPoint4 : Applicable speaker impedance: 4Ω, 6Ω, 8Ω. BulletPoint5 : Power supply voltage: 5VDC or 3.7V lithium battery. Color : #287 ExternallyAssignedProductIdentifier : 7898713131790 ExternallyAssignedProductIdentifier1 : 0671506538092 ExternallyAssignedProductIdentifier2 : 671506538092 IncludedComponents : No ItemName : Audio Amplifier Board, Channel Amplifier Board 2x6W Power Amplifier Board DC 5V / 3.7V with Charging Management HF69B, 4Ω, 6Ω, 8Ω Power Amplifier ItemPackageDimensions_Height : 1 centimeters ItemPackageDimensions_Length : 8 centimeters ItemPackageDimensions_Width : 4 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : electronic-component-audio-amplifiers Manufacturer : Wisoqu Material : Aluminum Material1 : Aluminum Material2 : Copper ModelName : Wisoquts7gbiha4w ModelNumber : Wisoquts7gbiha4w NumberOfBoxes : 1 NumberOfChannels : 2 NumberOfItems : 1 PackageLevel : unit PartNumber : Wisoquts7gbiha4w ProductDescription : Features: 1. This is a 2x6W amplifier board with management that can be powered by lithium battery. 2. Small heat production in standby, good stereo quality, suitable for small speakers. 3. Output power 6W+6W, channel stereo. 4. Applicable speaker impedance: 4Ω, 6Ω, 8Ω. 5. Power supply voltage: 5VDC or 3.7V lithium battery. 6. Charging interface: When using lithium battery tp supply power, the charging interface 5 volts power supply or mobile phone charger can a single lithium battery. (The management circuit limits the battery to a maximum voltage of 4.2VDC) Friendly remind: When sliding the switch to ON, Micro USB port is the charging port, powered by the lithium battery to work; When sliding the switch to OFF, Micro USB port is the power supply port, the module can work without connecting lithium battery.