TPA3116D2 uses a small radiator to provide 2x50W/4Ω output power, mainly used for small/micro-component sound bars, aftermarket automotive electronics, CRT TV and consumer audio. The speaker load impedance can be 4-6-8 ohms, of course, the power is also different. Name:50Wx2 dual track digital amplifier board Model:XY-502 3ower Supply Voltage:DC 4.5-27V Output Power:50Wx2 Protection Function:reverse connection protection,overvoltage protection,undervoltage protection;overheat protection,short circuit protection Signal Noise Rate: 102dB Channel: 2 size:63x51x22mm Material:plastic colour:Blue Package Contents: 1 x Amplifier Board Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.