OMPHOBBY M1 RC Helicopters Dual Brushless Motors Mini RC Helicopter for Adults Direct-Drive 3D Remote Control Helicopters-BNF. Main Motor: Sunnysky R23-2. Tail Motor: Sunnysky RO8-2. Main Rotor Diameter: 290mm(Approx 11.4in). Tail Rotor Diameter: 46.5mmApprox. 11.4in6.46in11.4in. Battery Type: 2S 350mAh 50C. Flight Time: Max flight time 9 mins, 4 mins for extreme 3D maneuvers. Servo: All metal gear, ploy carbonate cased, high-performance servos. Flight Controller: Receiver integrated, also support S. Bus\DSM\DSMX receivers(Built-in FUTABA authorized SHFSS receiving protocol). Helicopter x1 EEP Box x1 Screwdriver x1 Charger Cable x1 Servo Horns x3 Several Spare Screws Wrench x1 Battery x1(Installed in helicopter). Remote Controller not included. Setup on a Spektrum Transmitter. M1 OMPHOBBY protocol version can directly bind the OMPHOBBY T6 remote controller, it comes with Futaba S. Bus interface and Spektrum DSMX interface. M1 Futaba S-FHSS protocol version can directly bind the FUTABA remote controller, it comes with Spektrum DSMX interface. It cannot bind OMPHOBBY T6 remote controller. RC model helicopters are not toys. These products are intended for use only by operation experienced users or adults with assembly, setup, commissioning, flying at a legal and approved flying field/area. This product is not suitable for children or those who have no experience in remote control helicopters. RC helicopters require a certain degree of skills to operate and maintain, and is a consumer item. Improper use of this product can result in serious injury or even death. Improper care and knowledge when repairing or disassembling this product can cause further failure of the product in different situations. As OMPHOBBY Zhuhai Edge Smart Technology Co. Ltd, its commercial partner, agent, and distributor is not responsible for over using, improper setup and assembly, abnormal loss of spare parts, modification or misuse. Inexperienced users shall not operate this product, without direct assistance and guidance from an experienced RC helicopter pilot. Meanwhile, the user must operate in legal remote control model flying field, pay attention to the personal safety of himself and others, and strictly abide by relevant national and local laws and regulations.