This box and toy itself are showing its age. The view screen is hard to rotate, the battery compartment has erosion (but no batteries), the strap is very short. I wanted this all for the looks (cosplay), till the day I might be able to purchase The Wand Company’s Tricorder (probably never at this point; 😕).
My parents bought this for me when it was new, as well as the phaser and communicator! The strap was the perfect length for me at that age…
I loved the little blueprint sheet that came with them.
This is why the strap was your length: age 4 and up.