● The technical performance meets the standard requirements of GB27900-2011 "Fireman's alarm".

● The appearance of the structure should be complete, the surface without obvious spots, bubbles, cracks and scars, the shell wrapped in bulletproof glue.

● Explosion-proof grade: no less than Ex ib IIC T4 Gb, copy of explosion-proof certificate provided.

● Waterproof performance: The rescuer is placed in a container with a water depth of 1.5 meters for 2 hours, and should not be entered.

● Climatic environmental performance and mechanical environmental performance should meet the standard requirements.

● The predictive alarm function, automatic alarm function, manual alarm function and low voltage alarm function should meet the standard requirements.

● Insulation performance: ≥550MQ under normal conditions, ≥550MQ after wet heat test.

● Allowable rest time: 30±1s.

● Warning time: 15±1s.

● Forecast alarm level intensity: ≥103dB.

● Alarm sound level intensity: ≥101dB.

● Continuous alarm time: ≥600min.

● Continuous startup time: ≥123h.

● Luminous brightness: > 300cd/m².

● Mass ≤220g.

● Provide a copy of the inspection report of the National fire equipment Quality Supervision and Inspection Center.