The Acer H81H3-AM V1.0 is an OEM motherboard produced by ECS (Elitegroup) for Acer systems like the Veriton X2631G. Because it is an OEM part, documentation is often split between Acer's support site and generic manuals for its base design, the ECS H81H3 series. Core Specifications Generic H81H3-AM V1.0 Motherboard User Manual
Audio: 3.5mm jacks for Line-out (lime) and Microphone (pink). Where to Download Documentation Acer H81h3-am V1.0 Manual