Automatic School Bell 120dB with Weekly Timer, 40 Programs & 1–99s Ring, 220V double chuck hand drill Measure curves

Measure curves

Each LED maps to a specific wire pair

set battery type and voltage in under 2 minutes

Turn heads on stage — vibrant printed design adds a bold

a weekend runner

Automatic School Bell 120dB with Weekly Timer, 40 Programs & 1–99s Ring, 220V double chuck hand drill Measure curvesNever miss a bell again automates ringing with up to 40 programmable weekly schedule groups, eliminating manual effort in schools, factories & institutions Heard across large premises delivers a powerful 120dB output loud enough for classrooms, factory floors, and public facilities even in noisy environments Customise every ring adjustable ringing duration from 1 to 99 seconds lets you tailor alerts precisely for lectures, shifts, or announcements