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In a world of WiFi hidden cameras and nanny cams, another popular type of spy equipment are covert voice and audio recorders. These “spy audio recorders” can be designed like many different things, and in the case of the VR500, is designed to look like a portable USB power bank. And best of all, it works as a functional power bank too - so you can place it almost anywhere and it won’t look out of place, one of the key components of any hidden audio recording device.The Pro Grade Portable US …