Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: Exactly what size/type BATTERIES fits this exact model Walker Game Ear Elite Digital HD Power 4 ?
Document: I love this listening device. Hearing aids are way out of price range for me, but the Walkers Game Ear Elite Digital HD Power 4 Beige Assisted Listening Device allows me to hear everyone and is easy to adjust to different circumstances on the go. I do wish they would include the silicone ear buds with the device.
I have noticed in the past few years that I'm not hearing what I used to. Some of my hunting buddies swear by the Walker's so I thought I'd give it a try. I purchased the Digital HD Power Elite to use in the field and found that I was able to hear a lot of what I was missing. I would take them off when I got in the truck on the way home and found that I was missing a lot more than I thought I was. I started wearing them on the ride home and then even to watch TV in the evening.
An early Christmas present for myself and after many years of wearing Walker Ear I and II I thought it was time to upgrade. I purchased two of the Digital HD units and on the second day of using them I heard a deer jump a ditch well before I could see it. Turned out to be a big 11 point buck so the only surprise was on the deer's part since I was ready well before he arrived. The old units were still good but do not have the volume range of these new units. Great product.
First off, I bought two of these in August for my moderate hearing loss, not for hunting, and was very pleased with them especially as my alternative was to spend $2,400 on a pair.I chose this model because of the ability to adjust the tone in two ways. I never actually tried the second method as switching to tone option 3 did what I wanted.Then when out walking the first Elite 4 fell off my ear - I only wear one which works for me - then a couple of weeks later I lost the second in a similar fashion.
You can turn off the Elite 4 by opening the battery cover, but that is no good for quick off and on convenience while still in place on your ear.Secondly the UltraEar BTE has a more flexible tube, also longer, and this permits the unit to fit snugly BEHIND the ear in a central position. Unfortunately the Elite 4 sits on TOP of the ear, and can easily be dislodged by normal head movement, glasses and so on.This is exactly, in my opinion, why I lost the other two!
After losing the first I customized the second unit by super-gluing a thin but fairly stiff nylon cord to the unit which reached down behind my ear. My hope was that it would keep the unit in place but it was not to be.Thirdly, each of the supplied ear tips are too large for my ear. I resolved this by using a smaller tip from another similar product.The Elite 4 is half the size of the UltraEar BTE version, but because the latter is well behind the ear size really doesn't matter in this case!Sure, I've bought a third because of superior sound quality and flexibility, but I'm always going to have it's less expensive brother on hand in case of emergencies!I'd give the Elite 4 five stars if it had the features of the UltraEar BTE, and sat behind the ear and not on it.
I would probably have tried the MDHearingAid next. You can buy it directly from the manufacturer website and get a 45 day return period. The others I considered are:* MDHearingAid Air (their $350 digital model, not the cheaper analog one)* Sound World Solutions CS50* AblePlanet Behind-the-Ear Amplifier (comes in ten colors)* Audicus aBlueI'll update this review after I've had the Game Ear a while. So far, it's meeting my needs very well.
The Walkers Game Ear Elite HD comes with a volume control that I set each time I turn the unit on. It has two other controls, one switches between different modes which I seldom use- though the 'wildlife' mode is enjoyable. The other tone control alters the amount of high frequency gain, but I felt little difference no matter what setting was chosen.Overall, high frequencies had a raspy hissing sound almost as if the speaker had a lisp. Perhaps that was due to not having heard any sibilant sounds for so long.
I got a lot more out of the Elite Power 4's  than what I thought I was paying for because I now use them more than just while I'm outdoors
I've owned this for nearly two months. So far, I'm satisfied with it. I'll start by answering some of the questions I wondered about before buying it.Battery life: The Game Ear comes with four generic size 13 zinc air batteries. Walkers estimates average battery life to be 360 hours (15 days). My first three batteries were the generic batteries that came with the Game Ear. They lasted 22 days, 18 days, and 2 days. The two day battery may have been my fault - see my next paragraph.
Answer: yes