Wireless rotor machine Dragonhawk X4 WirelessThe Dragonhawk X4 Wireless is a lightweight and very handy rotor machine with an LED display. Dragonhawk X4 Wireless is equipped with two 900mAh lithium batteries that charge in 2 hours and keep the machine running for 3 hours. The batteries can be constantly replaced to keep the machine running smoothly. Features Weight: 120 g Stroke: 3. 5 mm Motor: coreless Working voltage: 4 12V Speed: 12V 10000 rpm Diameter: 22mm Length: 134 mm Warranty: 6 months;