Does the indoor receiver need to be plugged into a wall socket?

No, the indoor receiver is 100% battery-operated using 3x AAA batteries, allowing you to place it anywhere on a desk or shelf without occupying a wall outlet.

Is this doorbell better than a Wi-Fi smart video doorbell?

This doorbell is better if you want a simple, instant setup that works during internet outages and power cuts, whereas Wi-Fi doorbells require complex app setups and constant router connections.

How do I pair the transmitter button with the indoor receiver?

To pair the devices, press and hold the volume button on the receiver for 5 seconds until the LED lights up, then immediately press the outdoor transmitter button to complete the pairing.

Can I install the transmitter button on my metal security gate in Hong Kong?

You should not install the transmitter directly on a metal gate, as the metal will block the wireless signal; instead, stick it to the concrete wall next to the gate.

What type of batteries does this doorbell system use?

The indoor receiver requires three standard AAA alkaline batteries, while the outdoor push button requires one 12V 23A alkaline battery.

Wireless Battery Doorbell (Silver)

Name: Wireless Battery Doorbell (Silver) | Plug-Free 433MHz
Brand: Sun Cheong Computer Company Limited
SKU: 21PS000676
Price: 48.0 HKD
Availability: InStock

Short Product Description

The A30-PRO Wireless Battery Doorbell (Silver) is a 100% wire-free, plug-free visitor alert system designed for ultimate placement flexibility. Operating on a reliable 433MHz frequency, it delivers a massive 280-meter open-air range and features a 29mm large speaker with 38 selectable melodies. Because both the transmitter and receiver run entirely on batteries, it is the perfect solution for areas without available wall sockets. Available in-stock at Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) in Sham Shui Po, this doorbell offers instant, drill-free installation for homes, elderly care rooms, and temporary offices.

Key Features

Complete Battery Operation: Both units are battery-powered (Receiver: 3x AAA, Transmitter: 1x 12V 23A), freeing up your wall sockets.
29mm Large Speaker: Delivers crisp, clear audio ranging from 25dB to 85dB, ensuring the chime is heard across large rooms.
38 Selectable Melodies: Choose from a wide variety of classic chimes and tunes to suit your personal preference.
Visual LED Indicator: The receiver features a colorful LED light that flashes when ringing, providing a crucial visual aid for the hearing impaired.
Zero-Damage Installation: Includes high-quality double-sided adhesive tape for instant, drill-free mounting of the outdoor button.

Full Product Description

100% Wire-Free & Plug-Free Convenience

This fully battery-operated doorbell system completely eliminates the need for wall sockets and messy wiring. Unlike traditional wireless doorbells that require the indoor receiver to occupy a valuable AC power outlet, the A30-PRO receiver runs on three standard AAA batteries. This allows you to place the chime anywhere you need it—on a bedside table, a living room coffee table, or even carry it in your pocket while moving around the house, ensuring you never miss a visitor or an emergency call.

Long-Range 433MHz Signal Penetration

Operating on the highly stable 433MHz radio frequency, this doorbell ensures reliable signal transmission through thick walls and multiple floors. It boasts an impressive maximum range of 280 meters in open spaces and a practical 20 to 50-meter range indoors with obstacles. Whether you live in a multi-story village house or work in a partitioned office, the signal will consistently reach the receiver to trigger the 29mm large speaker and the visual LED alert.

Pro Tip from Our Technicians

Always avoid mounting the outdoor transmitter directly onto metal surfaces like iron gates or stainless steel doors. Our Sham Shui Po security specialists warn that large metal objects act as a shield, severely blocking the 433MHz wireless signal and reducing the doorbell's range. If you have a metal gate, we recommend sticking the transmitter to the adjacent concrete wall or wooden door frame for optimal performance.

Technical Specifications

Model: A30-PRO
Color: Silver (with White body)
Operating Frequency: 433MHz
Wireless Range: Up to 280m (Open Area) / 20-50m (Indoors with obstacles)
Receiver Power Supply: 3x AAA Alkaline Batteries
Transmitter Power Supply: 1x 12V 23A Alkaline Battery
Volume Range: 25dB - 85dB (Adjustable)
Melodies: 38 Chimes
Transmitter Dimensions: 76mm x 45mm x 20mm
Receiver Dimensions: 90mm x 55mm x 25mm

Delivery Options

Local delivery within Hong Kong and in-store pickup.
Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
In-store pickup details (location and time) will be confirmed by email or phone message.
Delivery times are estimates and may be affected by weather or unforeseen circumstances.

FAQ Section

Does the indoor receiver need to be plugged into a wall socket?No, the indoor receiver is 100% battery-operated using 3x AAA batteries, allowing you to place it anywhere on a desk or shelf without occupying a wall outlet.
Is this doorbell better than a Wi-Fi smart video doorbell?This doorbell is better if you want a simple, instant setup that works during internet outages and power cuts, whereas Wi-Fi doorbells require complex app setups and constant router connections.
How do I pair the transmitter button with the indoor receiver?To pair the devices, press and hold the volume button on the receiver for 5 seconds until the LED lights up, then immediately press the outdoor transmitter button to complete the pairing.
Can I install the transmitter button on my metal security gate in Hong Kong?You should not install the transmitter directly on a metal gate, as the metal will block the wireless signal; instead, stick it to the concrete wall next to the gate.
What type of batteries does this doorbell system use?The indoor receiver requires three standard AAA alkaline batteries, while the outdoor push button requires one 12V 23A alkaline battery.

Target Users / Applications

Elderly individuals needing a portable, battery-operated emergency call button by their bedside.
Tenants in rented apartments looking for a drill-free, non-permanent doorbell solution.
Residents in multi-story village houses needing a receiver they can move from the living room to the bedroom.