["brand new and high quality\nFeatures:\n5.0 Bluetooth-compatible version has higher transmission efficiency, and longer transmission distance.\nLarge size black gold heat sink ensures efficient heat dissipation.\nWith a switch, potentiometer can be used to adjust the volume,, easy to control the volume, very suitable for DIY speakers.\nCopper for DC connector is adopted to withstand high current and no heat.\n4 x 470uF green gold capacitor guarantees the power storage capacity, and the continuous and stable power supply is the premise of good sound quality.\nIt comes with a for DC for head with cable, which is for the input power interface of this product. Even if you don'for t have the for DC for head adapter or battery, you can connect it easily.\n\nSpecification:\nMaterial: Fiber glass board + Electronic component\nSize: app.69 x 53 x 22mm/2.72 x 2.09 x 0.87in\nColor: As picture shown\nQuantity: 1 Pc\n\nParameter:\nModel: ZK-1002L\nBluetooth-compatible Version: 5.0\nChip Solution: Domestic\nWith or Without Filter: Yes\nAdaption Supply Voltage: 5-24V (Optional 9V/12V/11/18V/24V adapter, high power recommended high voltage)\nAdapter Speaker: 30W-200W, 4Ω-8Ω\nNumber of Channels: Left and right stereo (Stereo)\nBluetooth-compatible Transmission Distance: 15m(Without occlusion)\nfor Protection Mechanism: Overheating, Short Circuit for protection\n\nTip: To have enough output power if the audio input is sufficient and the supply voltage/current is sufficient. The power supply voltage is higher and the relative power will be larger. The speakers with different impedances will have different output power. In the for case of sufficient voltage and current, the larger the ohms of the horn the smaller the relative sound power. Please pay attention!\nPower Supply Voltage: 12V-8hom speaker/24W (Left channel) + 24W (Right channel), 4 ohm speaker/40W + 40W\n 15V-8homs /32W + 32W, 4 ohm/greater than 60W + 60W\n 19V-8homs /64W + 64W, 4 ohm/greater than 80W + 80W\n 24V-8homs /72W + 72W, 4 ohm/greater than 100W + 100W\n \nNote:\nNo retail package.\nPlease allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nPackage includes:\n1 x Bluetooth-compatible Amplifier Board"]