A4Tech just busted out another new mouse novelty for Royche retail in Korea. Meet the NB-57D battery-free wireless optical mouse. Yeah, battery-free as in no battery required, which solves at least one of the biggest issues with setting the mouse free, or nearly so since the USB mouse pad is a critical part of the magic. See, it all works via a process dubbed "magic magnetism," which is an apparent A4Tech cocktail of electromagnetic induction and RFID technologies bundled into the kit. The mouse delivers an 800DPI sensitivity and features 7-buttons plus a scroll-wheel which can be endlessly mapped to shortcuts via the included 2X-Office software. According to AVING, it's yours for right around 20,000 Korean Won or just about $21 -- that's a big tech bang for the buck. Just don't go wearing your fancy Bluetooth watch while mousing around that potentially volatile mouse pad, ok folks?

[Via AVING]

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