Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Does it have the strap holder?
Document: put on NIKON D3200 no problems. Charge my batteries and it runs all week even with video on 2 batteries. will even run with just one. For 25.00 you cant go wrong. Comfortable grips and I added a hand strap. very comfy. lightweight too.
Battery grip holder works very good and with 2 batteries holds a charge well. I was very pleased with this product.Will tell friends about this product
It does exactly what it claims to. Fits tightly against the bottom of my Nikon D3200 and holds two batteries. It has a second shutter release button but in order to use that, you have to use the included short cord to connect the holder to the socket on the side of the camera. Now I'm a real pro photographer.
Really brings sturdiness and a nice grip and look to your camera. It works with just one battery, but has the slot for 2. I did not have 2 batteries when I ordered it, but it worked great with one. I lent my camera to my mom who is an avid photographer and she really enjoyed the grip much more than just the camera by itself. I also have the hand strap, which I prefer over the neck/ shoulder strap and it works quite well with this grip!
MET MY NEEDS AND I LOVE THE WAY Neewer New Professional Vertical Battery Grip Holder for Nikon D3100 SLR Digital Camera EN-EL14 Batteryby Neewer FEELS IN MY HAND AS SHOOTING, ALSO MY STAFF MEMBER LOVE IT TO THEY ALL HAVE THEM.
Now I feel the camera is securely held by all of the fingers on my right hand, instead of just three(3) fingers of my right hand. (thumb, index and middle finger)I also noticed that my walk-around lens(55-300mm VR)felt way better balanced than it did before I put the grip on.I would not hesitate to recommend the Professional Vertical Battery Grip Holder for Nikon D3100 to anyone with a D3100.
I am very glad that I purchased this item. It adds weight and bulk to the light weight of the D3200. I did find however that the batter cover off the D3200 did not fit into the holder on the grip, either that or I was afraid it would break. I did not however, try and non-Nikon battery in the first position to see if I would get the infamous Error message, but I did use a non-Nikon battery in position 2.
works great with my Nikon d3100 best Buy so far you'll not regret this purchase well worth just make sure you get some extra batteries to go along with it
works exactly like the one on the camera! i'd say if you want a battery grip for your D3100 order this one!!! trust me this product works.
very well made, light weight.i love this battery grip its a must have for photographers with a d3100 ,and d3200  its a world of difference with the grip and also the extra battery space comes in handy.although constructions feels kinda cheap because of the plastics don't let this fool you its very well built and does the job well.
Answer: The strap that goes around your neck will attach to the camera. I use a hand strap that will mount to this unit. Other then those too I don't know what kind of strap you are referring.