I have be carry and use MAGLITE flashlight for longer than I can remember . from the `` aa '' size to the `` 6d '' size , they have all be reliable dependable and without failure every time I need they , until they be either lose or steal . they put serial number on they just for this reason . be careful who you loan they to , as they be highly coveted and they have be know to grow leg and walk away . while I be at sea in the Navy , I accidentally drop one over the side at night . I have no idea how deep the water be as I watch the light sink into the inky black depths for almost 20 seconds . but , that be as `` water resistant '' as I will ever need . the `` 2d '' size be the ideal size for store in you glove box , or in the gadget drawer of you kitchen or on you workbench . they be great for all size of hand , and tough enough to withstand accidental drop , bang and kick . and the switch in particular be sturdy enough to resist continuous , repetitive on\/off testing by curious youngster . they be perfect in any emergency situation ; such as the California rolling blackout , or a flat tire on the side of the freeway . I keep one in every car I own and I give they to my child to keep in they car also . plus there be several in strategic place around my house and garage . nothing else I have ever own , except maybe my dog , have be so reliable or dependable -lrb- I do not own my very reliable and very dependable wife -rrb- . and when it come to present , and those hard to buy for people on you list . no one , on any occasion , will ever be disappoint when they open a MAGLITE flashlight . and as a giver ; neither will you .