RC EYE One weighs less than 100 grams, it reacts sensitively to wind or draughts. The RC EYE One is tiny, very strong and durable. It is powered with a lithium polymer battery. You can just simply charge the LiPo battery (7.4 V 350 mAh) by using the charger provided. The copter is ready-to-fly. It is supplied fully built with no assembly required.