All Leica Disto’s are included with a lanyard / hand-loop to prevent an accidental drop.
To install the lanyard:
1. Locate the 2 small holes near the base on left or right side (some units have these on both sides).
2. Squeeze the small loop at the end of the lanyard and push it into one of the holes. You may need to work it back-and-forth slightly until it comes out the second hole. It is sometimes easier if you can remove the battery door.
3. Loop the entire lanyard through the small loop and pull tight.