【1. I have Arthritis , Would some one like me be able to handle one?】- Yes - it's easy to use with arthritis - it has silicone all along the handle so it doesn't slip. You don't have to apply pressure to get it to work - just hold it in place - I think it's wonderful and easy to use - especially if you have arthritis.
【2.Is this waterproof ?】- Yes, it is waterproof but only in the shower. The instructions say not to submerge it in the bathtub. Great product!
【3.How long is the handle?】- The handle is 8 inches in length. If you count the length of the hanging hook on the end as well as the base of the spinning brush, It's about 12 inches from brush to end of the handle.
【4.How to open? 】- Push on the little button on the bottom of the wand and hold it in while sliding the panel open. It was very hard to open my first time but it did come open finally. Make sure you get it closed all the way after putting in the batteries.