The unit w/o the clip is only about 1 1/4 x 1 1/2". The magnet is strong enough to stay in the clip. I wore mine on my belt last round and it worked for me as easy as GG. I'm still learning but I believe this unit has potential.
On another note. We played a course Monday that wasn't mapped correctly. Today, Wednesday, they responded via email and had updated the course. Call me impressed.
Really hard to find parts or replacements since the owner/designer died suddenly and nobody picked up the patents. I still have the original I purchased, but the shaft broke where it inserts into the putter head and so all I have is the parts. Let me know if you need anything. I would be happy to ship them to you for the cost of shipping.