Features: Material: PC and ABS housing to protect the inside from erosion. Chip Control: The warning light is controlled by the chip. Solar Powered: Solar power, no electricity needed, energy saving. Easy Installation: Compact design, no other tools needed, easy installation. Applicable Usage: Suitable for home, yard, outdoor traffic and so on. Specifications: Shell Material: PC+ABS Light Source: LED Size: About 150x40 mm(Length*Width) Color(Light color): Red, Yellow Solar panel: 100mAh(Built-in) Battery: 400 mAh Rechargeable Battery(Built-in) Visual range: Approx. 500-1000 m Flicker frequency: Approx. 50 times/min Package Included: 1 pc* Warning LED Lamp(Built-in Solar Panel And Rechargeable Battery) Noted: 1. Please fully charge the device under sunlight before first use. 2. If there is no enough sunlight in 3 months, the battery may run completely flat, and will decrease battery life, so please charge in time. Once it's fully charged, unlock the device and lighting system. Otherwise, it won't work anymore. 3. If there is no enough sunlight, especial in North countries. it may take longer time to fully charge the device. This is very normal for solar products.