There are any number of reasons you might want a hidden spy audio and voice recorder.
sound quality
How your recording will sound like, depends on many things. What do you use to record or where do you place the recording device? And how much background noise is there? Audio cleanup plays an important role when you have lot of audio background noise. Do you know what is the biggest weakness of a hidden recording device? Bad placement. Just by placing the recording device at the wrong place can result a useless audio badly needing audio noise removal. If the device is easy to spot, it becomes obvious. Hide it in a particularly noisy spot, you will get an unclear recording.
You need to carefully consider the best spot to place the recording device. Knowing where the sound source is going to be, try placing the device as close as possible to it, in order for it to function correctly and give you clear and usable recordings. You may be recording with a smartphone and they don’t have very good microphones to begin with. audio cleaner
PLACEMENT
Designing any piece of “hidden” equipment requires you to meet some unusual criteria. For example, if you’re designing a wall outlet pinhole spy camera, the lens has to be invisible. Similarly, a hidden recorder with a big, obvious microphone isn’t going to work well. You also can’t have any bright, blinking lights, or any mechanical components that might make noise. So, what makes a spy audio worth buying? You need to look for three main attributes: a long-lasting battery, easy concealment, and convenient data access and storage. Here are a few pointers for looking at each of those features. See the top choices.
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battery
Different audio recorders will use different types of batteries. Some will be rechargeable, while others will be replaceable. Rechargeable batteries are usually best, since you don’t have to open the recorder housing for a replacement. Ideally, any modern rechargeable recorder will use a USB charger. There’s no need for an overpowered barrel-style charger on a device this small.
When it comes to the actual longevity of the batteries, there are two measurements: standby time and recording time. Standby time measures the amount of time the recorder can sit idle in voice recognition mode. Recording time, on the other hand, measures how much actual recording you can do on a single charge. So if a recorder has a standby time of 15 days, it can monitor and remain active for that amount of time.
But the same recorder might also have a recording time of 20 hours. If on the first day, the recorder does five hours of recording, it will eat through a quarter of the battery. As a result, the standby time would be reduced by 25 percent, or 3 ½ days, plus the full day of standby time. So after that first day, you wouldn’t have 14 days of standby remaining; you’d have 10 ½ remaining.
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Concealment
Concealment can take many forms, depending on how you’re using the recorder. In its most basic form, a recorder can simply be a tiny box that’s easy to hide. Alternatively, it could be disguised as another electronic device, or even a piece of clothing. Generally, the latter is a better choice if you’re personally present for the recording. You’ll maintain full control over the recorder at all times. On the other hand, going small and hiding the recorder is a better choice if you’re leaving it in place. Avoid recorders with fancy logos, blinking lights, or bright colors. Stick with plain black or grey, without any markings.
data access and storage
After you’ve captured your audio, you’ll need some way of recovering it. Most modern recorders use simple on-board storage. Some will use a Micro SD card, but this requires a slot and additional hardware that makes the recorder larger. On-board flash storage, on the other hand, is as simple and compact a solution as you’ll find.
How much storage is enough is an entirely different question. It depends on what you need to accomplish. If you’re conducting surveillance, more is generally better. You never know how much junk audio you’re going to pick up. When something relevant happens, you’ll want to have some space left! If you’re just recording a meeting or a class, having tons of space is less of a concern. That said, you might want to have some extra just in case. If you haven’t had time to download your last notes, you don’t want to have to overwrite them.