noun
switch (for a light); flasher unit
Technical term for a device that turns a light on and off, or causes it to flash. Used in electrical contexts.
廊下の点滅器が故障したので交換した。
The light switch in the hallway broke, so I replaced it.
この点滅器は自動で点灯と消灯を繰り返す。
This flasher unit automatically repeats turning on and off.