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●Apply to Trex450 all types ●Each set of Night Blades is carefully constructed to maintain static balance for weight, these night blades provide excellent visual orientation for flying at night, use very bright LEDS and rechargeable Li-Ion battery (light weight, big capacity, long operation hour). ●Use 3K carbon fiber material, and unique forming technique, improve anti-twist, suitable for extreme 3D flight. ●Feature:   1.Low voltage pre-charging   2.Short circuit protection   3.CC/CV charging method   4.Dynamic battery resistance compensation to deduce charging time   5.Dual LED indicating light, Detected function of battery status	●Shape: Symmetrical wing ●Length: 325X32mm ●Width: 4.7mm ●Shaft Diameter: 3mm ●Weight: 52g/set ●Balance stickerx2 ●Night Blade Connector(3 pin)x2