Model: DZ-L1/DZ-L1S Visible range:0-3km(About 2 NM) Rated power:1.5W Battery capacity (lithium cell):3600mAh Working voltage:3.7V Charging current:150mA Discharging current:320mA Protection grade:IP65 Working temperature:-10℃~55℃ Housing material:PC Solar panel material:Polysilicon Light source: 18*chip LED Light color: red/white/green/yellow( other color can be customized) Flash frequency changes with the working voltage, if working voltage higher, it flashes faster, and vice versa