Features 1、[Dual Channel] For XH‑A157 dual channel digital power amplifier board, input voltage is DC5V, stable output, very practical. 2、[3.5mm AUX] Uses 3.5mmAUX audio input, onboard 50K audio adjustment relay, which can be used to turn on and off the power amplifier. 3、[Free Adjustment] The volume can be adjusted freely. This power amplifier also has a dual channel audio output with a power of 2 x 3w. 4、[Plastic Material] The Power amplifier board is made of finely crafted plastic material, which is sturdy and durable and has a long service life. 5、[Lightweight and Portable] Digital power amplifier board is light in weight, small in size, easy to carry and store, convenient and fast, and stable in performance. Specification Item Type: Digital Power Amplifier Board Material: Plastic Input Voltage: DC5V Audio Input: 3.5mm AUX Audio Cable Number of Channels: 2 Channels Output Power: 2 x 3w Size: Approx. 37 x 22 x 43mm / 1.5 x 0.9 x 1.7in Package List 1 x Digital Power Amplifier Board 3 x Line 1 x Hnob Hat 2 x Washers