Item Type: TDA7377 Digital Power Amplifier Module Material: PCB, Metal Chip: TDA7377 Power Supply: DC9-18V, Recommended 12V Output Power: Can Be Connected to 4-8 Speakers, Maximum 2x35W Stereo (18V4) Input: 3.5mm Input 3P Extension Input Port Protection: Power Input Reverse Connection Protection, Short Circuit, Overcurrent, Overheating Package List 1 x TDA7377 Digital Power Amplifier Module 1PROFESSIONAL DESIGN: TDA7377 digital power amplifier board module, 2x35W dual channel stereo, ideal for DIY sound equipment players. 2INPUT, PORT PROTECTION: TDA7377 power amplifier board module's input is 3.5mm input, 3P extension input; port protection for power input reverse protection, short circuit, overcurrent, overheating. 3POWER SUPPLY, POWER: TDA7377 power amplifier board module's power supply is DC918V, recommended 12V. 48 speakers can be connected, maximum 2x35W stereo (18V4). 4CIRCUIT BOARD, CAPACITORS: TDA7377 power amplifier board board adopts high grade pure black sunken gold circuit board, imported for KEMET sound capacitors, dual imported for NICHICON high capacity filter capacitors for each channel. 5FINE CRAFTED: TDA7377 digital power amplifier board module with special order pure black copper terminals, gold plated sound input terminals, customized 3P pure black terminals.