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This is a very interesting alternative to a wireless lav and makes a LOT of sense: cheaper, much less prone to interference, longer battery life. About the only downside I can think of (I haven't gone hands on with it yet to confirm) is that there's no way to monitor it remotely the way you can with a wireless system or Sony's little jewel of a recorder, the SX2000 (it connects to a smartphone app called REC Remote via Bluetooth).