Features:Good product with high quality material.With stable performance， it is practical and durable.Fine workmanship and perfect style.Fashionable design， match with your quadcopter perfectly.It can help your quadcopter fly much higher and quicker， more secure.Easy to install and convenient to use.Designed for Wltoys V977 RC Helicopter. Specifications:Suitable for: V977Package size: 5 * 5 * 1cm / 2 * 2 * 0.4inPackage weight: 5 g / 0.2 ozPackage list:1 * Original Wltoys V977-005 RC Helicopter Power Star X1 Receiver Board