ไซเรนมือหมุนสีแดง110dB.ขนาด4นิ้ว

Fixed Hand Crank Operated Air Raid Alarm Handheld Siren Features: Manual hand crank operated siren, will produces a loud sound; it does not need any outside power source. Ldeal for getting people's attention, or alerting workers for lunchtime, and good for many other uses. Fully capture mosquitoes, strong air duct design, and expand mosquito control space. Loud sound 110±2 dB Effective range: 500m Material:Aluminum alloy Color: Red ติดต่อโทร 088 258 1380