This four in one bicycle light, bicycle lights, mobile phone holder, power banks, loudspeaker are integrated into one, avoiding the clutter of multiple devices, efficient and practical. Features: Four in one design, bicycle lights, mobile phone holder, power banks, loudspeaker are integrated into one, which is cost-effective. It does not need to buy a variety of equipment. 130 dB wire controlled horn, with five sound modes, long press for three seconds to switch the sound effect. High brightness 550 lumens T6 double lamp, high brightness, long visual distance, can illuminate the front, effectively improve the safety of riding. The lamp holder can be rotated, and the lamp holder can be adjusted up and down by about 45 ° to meet the needs of users flexibly. There are three light modes to choose from: highlight mode, medium light mode and flash mode. There are two kinds of high capacity batteries to choose from, which can be used as a power banks. You don't have to worry about the battery failure of your mobile phone for long-distance riding. Chargings and discharging independent interface, with USB chargings cable, easy to use. It has 4 power indicator lights, which can clearly display the remaining power and remind users to charges. Shock absorption and anti-skid, no damage to the phone, high-density sponge pad at the bottom and anti-skid silicone embedded on both sides protect the mobile phone and improve the shock absorption effect. IPX4 life waterproof, ABS sealed shells, rainwater is not easy to leak. (pay attention to block off the USB plug) Adjustable quick release bracket, 3-gear adjustable bracket, equipped with removable anti-skid gasket, suitable for most handle diameters. The base can be rotated, and the base can be adjusted by ± 15 ° to better adjust the direction of the lamp. Compatible with a variety of models, most bic