High-speed and stable transmission are supported by Bluetooth-compatible 5.0 version.The decoder board with universal Micro USB 5V power supply is rechargeable and power saving.Using the premium PCB material, the product is durable, lightweight and portable.The length of this product is 3cm, the width is 3cm and the height is 1.5cm.It is suitable for home audio systems and active speaker applications.Item Name: Power Amplifier BoardMaterial: PCBColor: Black, RedUSB Power Supply: Universal Micro USB 5V Power Supply3.7-5V Power Supply Pad: Realize the External 3.7-5V Battery Power Supply ModificationLED Indicator: Blue Light in Bluetooth-compatible Mode is On3.5mm Stereo Audio Interface: Standard 3.5mm Interface, Output Stereo Sound Source, can Insert Headphones, Connect Power Amplifier and Other EquipmentFeatures: Stereo, Lossless Music, PortableSize Details: 3cm x 3cm x 1.5cm/1.18" x 1.18" x 0.59" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Power Amplifier Board