2x6W DC 5V 3.7V Speaker Modified Stereo Bluetooth amplifier board can connected Lithium Battery

This is a 2x6W DC 5V 3.7V Speaker Modified Stereo Bluetooth amplifier board can connected Lithium Battery that can be powered by lithium battery. Small heat production in standby, good stereo quality, suitable for small Bluetooth speakers. Features:  Small standby heating, good-quality stereo, suitable for Bluetooth speakers. Output power 6W 6W, two-channel stereo, good sound quality. Lithium batteries can be connected, with charge management. When using a lithium battery, the charging interface can be charged with a 5-volt power supply or a mobile phone charger to charge a single-cell lithium battery. The charge management circuit limits the battery to a maximum voltage of 4.2VDC. Specifications: Item Type: Amplifier Board Model: HF69B Supply Voltage: 5VDC or 3.7V lithium battery Applicable Speaker Impedance: 4 ohms, 6 ohms, 8 ohms Channels: 2 (2.0) Output power: 6W 6W dual channel stereo Maximum Power Per Channel: 10W Current: 2A Size: 7x4x0.7cm Weight: 11gm Package Includes: 1 x 2x6W DC 5V 3.7V speaker modified Stereo Bluetooth amplifier board Note :  When the sliding switch ON Micro-USB port is the charging port, powered by the lithium battery to work, slide the switch OFF when the Micro-USB port is the power supply port, you can not take lithium battery work.