GET RID of WIRES - [Upgraded] BooYu warning strobe lights are wirelessly designed with built-in battery power. It provides roughly 30 hours of long runtime and features a fast-charging function that allows the battery to be fully charged in just 3 hours. Faster charging speed than other products as well as longer battery life with two charging methods (equipped with home charger and car charger).EASY to USE - BooYu emergency warning light has 14 different flashing modes, just use the red button to switch the flashing mode, keep press and hold for 2s to control the light bar OFF/ON (last pattern memory recall)..FEATURES - The emergency strobe light bar has a total of 12 high-intensity Led chip. Visible in day and night and universal compatibility for all emergency Vehicles and Trucks, Construction car, Safety, Security, Snowplow, Postal and City service Workers, Tractor, Bus, Tractor, Trailer, etc..HIGH QUALITY - Exterior consists of aluminum alloy housing with a steel bracket and PC Lens Material to endure all kinds of weather conditions. IP66 Waterproof Rate. LED Lifespan up to 50,000 Hours..POWERFUL MAGNETIC BASE - Come with 2 powerful magnetic bases and 8 magnets inside, it effectively enhances the adsorption force. It is easy to hold the roof tightly and is equipped with protective rubber pads and suction cups.