<br> 1, <br> 5.0 bluetooth version, transmission efficiency is higher, transmission distance is longer. <br> 2.Large size heat sink ensures efficient heat dissipation.3, potentiometer to adjust the volume, with a switch, easy to control the volume, very suitable for DIY speakers.If it is a metal box, you need to draw out the bluetooth antenna. <br> 4.Copper DC connector is adopted to withstand high current and no heat. <br> 5.4*470uF green gold capacitor guarantees the power storage capacity and the continuous and stable power supply is the premise of good sound quality. <br> 6.The DC head with cable can be compatible with the input power interface of this product. <br> Even if you don't have the DC head adapter or battery, you can connect it easily.Adaption Supply Voltage: 5-24V (9V/12V/15V/18V/24V adapter, high power recommended high voltage)Power Supply Voltage: 12V------8hom speaker/24W (Left channel) + 24W (Right channel), 4 ohm speaker/40W + 40W,15V------8homs /32W + 32W, 4 ohm/greater than 60W + 60W,19V------8homs /64W + 64W, 4 ohm/greater than 80W + 80W,24V------8homs /72W + 72W, 4 ohm/greater than 100W + 100WParameter:Product Name:HIFI with filter 2X100W Bluetooth digital power amplifier boardModel: ZK-1002LChip Solution: domesticWith or Without Filter: YesAdapter Speaker: 50W-300W, 4 ohm-8 ohmNumber of Channels: Left and right stereo (Stereo)Bluetooth Version: <br> 5.0Bluetooth Transmission Distance: 15m(Without occlusion)Protection Mechanism: Overheating protection,Short Circuit protectioncolour:blackMaterial:Metal +pcPackage Contents:1* Bluetooth <br> 5.0 Digital Amplifier Board1* shell1* screwdriver1* power cordNotes for use: the power switch on the board is standby switch, and the machine is in standby state with low power consumption after the switch is turned off. <br> Tocompletely turn off the power or to remove the DC plug on the machine for a long time, it is ok.Tip: To have enough output power if the audio input is sufficient and the supply voltage/current is sufficient. <br> The power supply voltage is higher and the relative power will be larger. <br> The speakers with different impedances will have different output power. <br> In the case of sufficient voltage and current, the larger the ohms of the horn, the smaller the relative sound power. <br> Please pay attentionOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. <br> The measurement allowed error is +/- 1-3cm.<br>