Doorbell Wireless $28.35 + Delivery ($0 with Prime/ $39 Spend) @ Eocean-Au via Amazon AU

Doorbell Wireless Waterproof Door Bell Chimes Kit , 300 Meter (1000FT) Long Range, 55 Chimes, 5 Volume Levels & LED Flash

Loud Enough Doorbell for Anywhere - 55 optional Melodies & 5 Adjustable volumes: 0 to 110 dB. The maximum is 110dB which the sound is loud enough, whether upstairs or basement, also suitable for the elderly living alone. Just press the volume key to set the volume level you want.

Humanized Mute Mode - The door chime receiver features 5 adjustable volume levels of 0-110 dB for you to choose. In mute mode (0dB), the LED light will flash, and won't disturb a sleeping baby.

Memory Function - Memory function makes the doorbell remember the last ringtone and volume, no need to reset even if after a power outage.

Wide Usage - Multiple use for home, office, garage, store, office, apartments, villas, garden, hospital, school, the old man and the disabled people etc.

300 Meter Long Operating Distance
With a long wireless range of 300 meter and strong signal penetration, the doorbell will never fail to alert you when someone shows up at the door. Enjoy a reliable and hassle-free doorbell system at home,in factories,offices,classrooms,apartment blocks,villas and other large areas.
Durable Transmitter
The transmitter uses a battery which has an ultra long three-year lifespan, freeing you from the hassle of frequent battery purchases. Functional between -30 °C to 70 °C (-22 °F to 158 °F) , its tough construction allows the doorbell to operate in even the harshest weather conditions.
With Unique Night Light
This home doorbell has a unique night light. Long press the middle button (backward button) of the receiver for 5-10 seconds to turn on/off the night light mode. The Little light can provide you with illumination at night, you can install it in doorways, staircase aisles and other place.
Convenient Size
We have upgraded the design of the receiver station, giving it a smaller size of just 9.5 (L) x 6.5 cm (W), so that it won't block off any neighboring power sockets.
Easy To Set Up
Just plug the receiver into a socket and fix the transmitter on a wall with the accessories provided.
Package Include
1 * Transmitter (battery included)
2 * Plug-in receivers
1 * Double-sided bonding tape
4 * Screws
4 * Anchors
1 * Small screwdriver
1 * User manual