On the bright side, the dv4-1555dx hosts superior quality audio via Altec Lansing speakers with SRS Premium Sound technology, as well as an HDMI output. This means users can enjoy videos with booming sound on either the notebook or on a compatible HDTV. Despite its superior audio, the dv4-1555dx is burdened by several critical faults: a poor battery life, a glossy display, a loud keyboard, and an uncomfortable touch pad. Keep in mind though that it does at least feature the Windows 7 operating system.