The QD228 headlight has the functions of daytime running lamp and horn (horn function is optional). it adopts lens light distribution system, matches with high-power LED light source, and adopts aluminum shell to dissipate heat, to avoid overheating of components and LED light attenuation. Its bracket passed the salt spray test for 72 hours. The fixing method of the product is simple and reliable, and the angle can be adjusted, which is suitable for various bicycles. The product supports wide voltage design, aiming at 36 and 48V batteries. It can be used in general without purchasing a single version. If there is a large demand for customer orders, OEM customer logo can be supported.Applicable environment: temperature: -20℃～60℃; humidity: 20%～80% Please don’t knock on the transparent cover of the headlight with a hard object, which can cause the cracking of the headlight. Q: How to deal with the problem the horn hoarse after the rain? A: This is mainly due to the water inside the headlight and the water drops on the internal diaphragm of the horn, after riding about 60 minutes or turning on the headlight about 30 minutes the water inside the headlight will be evaporated, then the sound of horn can be returned to normal. The fixed screw of headlight will be loosened by vibration after a period of time, please tighten it properly with the tool.Applicable environment: temperature: -20℃～60℃; humidity: 20%～80% Please don’t knock on the transparent cover of the headlight with a hard object, which can cause the cracking of the headlight. Certificate approval: ECE Class-A GB/T 31887.1-2019 Size: L73.5mm W60mm H73.5mm. Weight: 95g. Material: PC+ABS+AL. Wiring: 4pins. Waterproof Level: IPX4. Horn: 85±5dB. Power: 2.5W. Voltage: DC36-48V. Center luminance: 20LUX. Light Source: LED.