1.Responsive operation 2.battery for balance charger 3.with LCD screen 4.easy ... : 80*44*85cmG.W./N.W.: 24.6/19.5KgDescription: 2.4G 4CH RC helicopter whit gyroCertificate : EN71,6P,ROHS,EN60825 ... screen, to display control effect ,so that easy for control. WL V911 2.4G 4CH RC single pro. helicopter whit gyro