ขาย คู่มือการใช้งานเตือนไซเรน 110dB เพื่อความปลอดภัยฉุกเฉิน ราคาที่ดีที่สุด

Decription: Features: It is used for emergency warning and easy to carry. Can be used for factories, families, schools, flood control, disaster relief,public and industrial occasions. Timely warning, reduce the loss of people 's property and casualties. By manually rotating the handle, the gearbox of the transmission step by step acceleration to achieve the purpose of sound, the sound depends on the rotation speed of the handle. Made of durable aluminium alloy,sturdy and wear resistant. Notice: Actual color may be slightly different from the image due to different monitor and light effect Please allow 1-3cm deviation due to manual measurement Specification: Material:Aluminum alloy Size:231x202x115mm Included: 1x Alarm