50,000 Hours of Lifespan and Quality. The high-illuminance battery used in this emergency light can be charged 300 times and operate for at least 27,000 minutes. Each full charge can be used for 90 minutes of emergency operation. Please note that this emergency light must be hardwired. And the lifespan of this exit sign is 50,000 hours. The headlights of this product can be rotated 180° and 360° in two positions, and each head is equipped with 24 ultra-bright SMD LEDs, illuminating every corner of the darkness. High Quality: The highest quality is the promise to every customer. This emergency light is made of a THERMOPLASTIC ABS HOUSING. This will not age even after prolonged use and ensures the sturdiness of each construction during installation and assembly. The test button used in this emergency light has undergone 1,000 tests to ensure that the emergency light can automatically turn on in the event of a power outage and that the test button will not fail after power is restored. </ p> Mounting completed in 5 minutes. Lights are suitable for wall-mount applications. Snap-on ceiling with captive mounting screws included with all lights. All Pros Line Latch electronic circuitry makes installation easy and economical. INNOVATIVE, easy installation in just minutes. The fully sealed, durable, maintenance-free lead-calcium battery is ideal for emergency lighting applications. It is suitable for LED emergency lighting or LED emergency lighting. Specification: Rated power: 3W Emergency time: 180 minutes <p >Battery voltage: LIR 3.7V 2500 mAh Conversion efficiency: 80% Lamp type: LED white light Power factor: 90% < p>Input voltage: AC90~280V Input frequency: 50-60 Hz Size: 230 x 105 x 60 mm Total weight: 600 g</p > Temperature range: 10~50