also: いれタイマー
noun
on timer
A timer that turns an electrical device on at a set time. Often contrasted with 切タイマー (off timer).
See also: 切タイマー
エアコンに入りタイマーをセットして、帰宅前に部屋を冷やしておく。
I set the on timer for the air conditioner to cool the room before I get home.
この照明は入りタイマーと切タイマーの両方が付いている。
This light has both an on timer and an off timer.
An off timer, which turns a device off at a set time, as opposed to 入りタイマー which turns it on.
Compound of 入り (iri, 'entering, turning on') + タイマー (taimā, 'timer').