Yes all my Sonic Screwdrivers have sound unless otherwise mentioned. All but one so far has had the default sonic sound. One PC Punk one has computer sounds.

Every Sonic will have at least some light via LED. Some are brighter or more prominent than others.

Only if you have hundreds of years for the calculations.

All of the Sonics can be disassembled and taken apart. But usually the bottom will unscrew and let you pull the battery case out enough to change the batteries. The normal batteries are 3 LR44 watch batteries.

COMMISSIONS:
Sonics are 90% metals. Mix of aluminum, brass, and steel sometimes. $175 US is typical. Can go up or down. Shipping and Import Fees not included. Drawings (even crude) are always helpful.

Can’t be too tiny. Normal width is 3/4 of and inch to one inch. Handle needs to be at least 4 inches. I cannot engrave intricate designs but I can offer vinyl designs. If it has claws they won’t pop open but will be movable. I can offer real crystals if I can locate one clear enough to shine. Mostly resin crystals. Mine are almost always 90% mixed metals.