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Typical heat dissipation: 81.89 BTU/hour, MTTR: 2 hours, Availability: > 0.99999, Noise at normal temperature (acoustic power): Noise-free (no fans), < 30, Noise at normal temperature (acoustic pressure): Noise-free (no fans), < 20, Working mode: Standard mode, Port isolation, Uplink aggregation, Flow control disabling, MAC address entry: 8K, Long-term operating temperature: 0 Degree C to 40 Degree C at an altitude of 0 -1800m (0-5906 ft.), Restriction on the operating temperature variation rate: When the altitude is 1800 - 5000 m (5906-16404 ft.), the highest operating temperature reduces by 1 Degree C every time the altitude increases by 220 m (722 ft.), Storage temperature: -40 Degree C to 70 Degree C, Long-term operating relative humidity: 5% RH to 95% RH (non-condensing), Long-term operating altitude: 0 - 5000 m (0 - 16404 ft.), Storage altitude: 0 - 5000 m (0 - 16404 ft.), Power supply mode: AC built-in, Rated input voltage: AC input: 100 - 240 V AC; 50/60 Hz, Input voltage range: AC input: 90 V AC to 300 V AC; 47 Hz to 63 Hz, Maximum input current: 3 A, Service port surge protection: Common mode: -+4 kV, Power supply surge protection: Differential mode: -+6 kV; common mode: -+6 kV, Ingress protection level (dustproof/waterproof): IP20, Heat dissipation mode: Natural heat dissipation, Certification: EMC certification, Safety certification, Manufacturing certification