Features: 3modes: fast flashing-slow flashing-constant light, meet different scene needs. Easy to install, widely compatible, for almost all quadcopters on the market. Bright warning light, night flight direction guide, safely flight. Color blinking light is convenient to distinguish the direction of the head and tail of the Quadcopter when flying at night. Strong battery: it can be used for about 120 minutes when flashing, and about 30 minutes when on. 8pcs CR927 button cell batteries + 4pcs adhesives included Specifications: Name: Quadcopter Flashing Night Light Light Source : Fast Flashing/Slow Flashing/Normal Light Brightness: 30-40lm Battery Model: CR927 Power: 0.5w Battery Capacity: (30mah) Use Time: Flashing About 120 Minutes; Constant Light About 30Minutes Net Weight: 3g/Pc Product Size: about 4.2x5.2x1.7cm/1.65x2.05in Note: Due to problem of light effects,there might be tolerances in product, please understand. Please allow 0-1cm error due to the measurements Package includes: 1Set Night Flying Lights