Micro Mosquito Toy Helicopter is the Bee's Knees, Yo

The Micro Mosquito is the smallest and lightest indoor fully-functional helicopter. It can fly in all directions and even hover. The RF remote even has multiple frequency options so you can buy multiple Micro Mosquitos and force them to battle in your own, personal Thunderdome. The Micro Mosquito retails for $70. – Travis Hudson

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Micro Mosquito helicopter takes to the tiny skies [Slashgear]

DISCUSSION

But with counter-rotating rotors for stability and that horizontal tail rotor, it cant "strafe" from side to side. I like the Picco-Z R/C better since it actually works like a real chopper. But if you want small, check out the Picoflier.