ขาย 120Db ระบบเตือนเสียงเตือนภัยในร่มแตรมินิฮอร์นสําหรับรักษาความปลอดภัยภายในบ้าน ราคาที่ดีที่สุด

Features: full volume at about 120 decibels, providing very loud sound. This harsh insert alarm can be inserted into your keyboard/console. It works with your system to respond to signals from the alarm keyboard/console. Strong and durable, long service life. Compact, lightweight, portable. Description: easy to installl. Easy to use. These trumpets can produce as powerful a sound as loud as loud, and are easily noticed. Specification: color: black and white material: plastic size: diameter 54mm, height 48mm rated voltage: 12V DC sound index: 120dB sound frequency: 3.8 kh2+10% transmission speed: 3H2 increase or decrease 10% packaging including: 1 x indoor alarm