ELPA

［เลิกผลิตแล้ว］กริ่งสัญญาณไร้สายตั้งโดยไม่ใช้แบตเตอรี่　WC-S6041AC

This wireless type requires no wiring, so wiring is easy! The receiver only plugs into the outlet, and the transmitter generates power by pressing, so no battery is required.
The push button is a waterproof type, so you can use it around water such as bathroom and toilet.