These are "Gokiraji", which is a wordplay on "gokiburi" (cockroaches) and "rajikon" (remote-controlled). Charge them via USB, and then they can be controlled via an infrared remote and make your skin crawl.
Watch in the video as they scurry about, with LED-lit butts. And when they flip over on their backs they're legs flail about, all roach like. Yours for ¥1,680 (US$21).