Features: Automatic Thermal Activation : The guide rails automatic fire extinguishing device activates at 170°C within 15 seconds without external power, providing reliably protected in high temperature environments like engine compartments. Rapidly Fire Suppression : Generates aerosol within 6 seconds of activation, effectively covering a 0.1M³ protected area for quick fire control in confined spaces such as electrical boxes or car interiors. Flexible Installation Option : Supports 35mm DIN rails mounting or adhesive side mounting, allowing easy installation without tools for both DIYer and professional users. Extreme Weather Resistance : Operates reliably in temperatures from -50°C to +90°C with 95% humidity tolerance, ensuring stable performances in harsh or humid conditions. High Visibility Red Design : Features a bright red nylon housing for quick identification during emergencies, enhancing safety in critical situations. Specifications: Activation methods: thermal activation, none external power supply required Activation temperature: 170℃ Activation response: Activate within 15 seconds after reaching temperature (starts to generate aerosol) Aerosol generation duration: ≤6 seconds Installation methods: 35mm DIN rails or adhesive side mounting Shell color: red Size:Approx.60x90mm/2.36x3.54inch Package Includes: 1pcs/2pcs/3pcs/5pcs/10pcs Automatic Fire Extinguishers note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.