effe -The Authentic Emergency Whistle from Japan-

2025.11.10

Hello, This is the Tennis Support Center Midorigaoka's blog.

First, I want you to see this racket-like key ring.

It's not just a key ring. The name is effe. Its identity is the emergency kit as a whistle because of its hollow structure. I will introduce and recommend this authentic emergency whistle.

Function

The effe can create loud and high frequencies sound, around 85db・4kHz(for human), 20kHz(for rescue dog). This tiny key ring can save your life for helping find you among the rubble.

Material

effe is mede in Sabae, Fukui Prefecture, Japan. Sabae is known as a factory city of glasses. The effe is made from acetate, the same material as glasses frames. Acetate is a renewable material derived from wood pulp and cotton. Unlike petroleum-based products that are more environmentally harmful, cellulose acetate is more eco-friendly. Acetate products are renowned for their exceptional durability, vibrant colors, and comfortable surface.

Background

effe is made in glasses factory in Sabae. The designers of effe felt the big importance of emergency kit after the earthquake disaster. Japanese has suffered from a lot of huge earthquakes(ex. 1.17 Hansin-Awaji, 3.11 East Japan). Then they came up with an idea, " The acetate is suitable material for whistle because of its nice look, comfort surface, and workability, isn't it ? " After that, They took 5 years to create effe by pursuing nice look, portability, best structure for sound function. As a result, effe was created.