Necs 55 v552 commercial grade large screen lcd display utilizes led backlighting to reduce the products depth and power consumption when compared to its predecessor the v552 also features built in 10w speakers and an open pluggable specification ops compliant expansion slot this future proofs the display and allows for the seamless integration of a computer or other necthird party component because video rs 232 control and power are passed internally from the display to the accessory