Product Details The E-flite® UMX™ A-10 Thunderbolt II Twin 30mm EDF (Electric Ducted Fan) ultra micro jet is updated and upgraded for more durability and power — while AS3X® and optional-use SAFE® Select technology make it easier to fly for more pilots in more places! Key Features Spektrum receiver with industry-leading 2.4GHz DSMX® technology Completely factory-assembled and ready to fly right out of the box Strengthened airframe including a carbon fiber reinforced fuselage and nose Real-time battery voltage telemetry via compatible Spektrum™ transmitters Fits 450–850mAh LiPo batteries for a wide range of performance and flight times In The Box (1) E-flite® UMX™ A-10 Thunderbolt II Twin 30mm EDF with: (2) Brushless Outrunner Motors (installed) (2) 30mm EDF units (installed) (1) Spektrum Receiver with (2) Brushless ESCs (installed) (1) Product Manual Needed to Complete (1) Full-range 5+ Channel Spektrum™ DSMX®/DSM2® Compatible 2.4GHz Transmitter (1) 2S 7.4V or 3S 11.1V 450–850mAh 30C LiPo with IC2® Connector* (1) Compatible LiPo Charger and IC2® Charge Lead *The SPMX8503S30 Battery Requires G2 Compatible Charger and IC2-IC3 Adpater (SPMXCA320) *Please Note – Spektrum IC2 Connectors and Charge Leads ARE NOT Compatible with EC2 Connectors