We have covered plenty of decent microphones for iOS and Android devices in the past couple of years. The Instamic happens to be a compact, wireless microphone with a waterproof design and app controls. It is so compact that you can use it to record audio in a discreet fashion.
The Instamic Pro microphone records in 48 khz/24 bit quality. It has mono, dual-mono, and stereo modes. You get multiple mounting options, which is a plus. The device can work with or without its companion app. The battery lasts up to 4 hours (mono mode). You can find out more on Indiegogo.