Doorbell | Wireless Doorbell | Harbro Electrical

Wireless doorbells at trade prices from Harbro Electrical, Peterlee. No cable run between the outdoor push and the indoor chime - everything connects by radio signal or Wi-Fi. The range covers professional AI video doorbells from Ajax (White, Black, Graphite), a wired-or-battery video doorbell from Ener-J, an EZVIZ smart video doorbell kit, and wireless door chime kits from Knightsbridge. Battery-powered, mains plug-in and wired AC/DC options all in one collection.

All prices exclude 20% VAT. Same-day collection from our Peterlee trade counter at SR8 2LY. Free UK Mainland delivery on orders over £70. For hardwired bell circuit installs, see the Wired Doorbells collection.

Browse Doorbell Transformers

Ajax Doorbell White, Black & Graphite - AI + PIR video doorbell Wireless or battery - Ener-J Flexi, Knightsbridge chime kits Wired option - Ener-J Flexi dual-power, Dahua wired kit Doorbell chimes - Knightsbridge plug-in and battery-powered Trade counter - same-day Peterlee, SR8 2LY

Types of doorbell: which is right for the job?

The doorbell market divides into five types. Use this table to match the product to the install before ordering.

Type	Power	Cable required	Best for
Wireless doorbell	Battery (push), mains or battery (chime)	No	Retrofit, rentals, quick installs
Wired doorbell	Transformer from mains	Yes - bell wire + transformer	New builds, full refurbs
Battery doorbell	Built-in rechargeable or disposable	No	Temporary, rental, no wiring budget
Video doorbell	Battery or wired (model dependent)	Optional	Security-focused residential and commercial
Doorbell chime	Mains plug-in or battery	No	Replacing or adding an indoor chime unit

Wireless Doorbells

Wireless doorbells use a radio signal between the outdoor push and the indoor chime - no cable run between the two. The range at Harbro covers battery-powered chime kits (Knightsbridge DC010, £17.05 + VAT), video doorbells with 1080p and app notifications (Ener-J Smart Flexi, £49.00 + VAT), and professional AI video doorbells (Ajax Doorbell, £149.00 + VAT).

Wireless Doorbells collection

Battery-powered chime kits, video doorbells and smart doorbells. No cable runs required.

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Wired Doorbells

Wired doorbells connect a push button to a chime via 2-core bell wire, powered by a doorbell transformer stepping mains voltage down to 8 to 12V AC. No batteries to replace, no signal interference - the right choice for new builds and full refurbishments. The Ener-J Smart Flexi also connects to existing bell wire for a continuous supply without needing a battery recharge

Wired Doorbells collection

Hardwired video doorbells and traditional bell circuit products. A doorbell transformer is required for all wired installations.

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Ajax Doorbell - professional AI video doorbell

Professional-grade video doorbell from Ajax Systems, in White (66390.125.WH1), Black (66391.125.BL1) and Graphite (66392.125.GP1) at £149.00 + VAT. Built-in AI classifies visitors as people, animals or vehicles before alerting. PIR sensor, IP67, Wi-Fi to 500m line of sight, AC/DC power with backup battery, tamper detection.

Specification	Detail
Price + VAT	£149.00 + VAT (£178.80 inc.)
Finishes	White, Black, Graphite
AI detection	Persons, animals, vehicles - classified before alerting
Motion sensor	PIR - precise, low false-alarm detection
Audio	Two-way with noise suppression and echo cancellation
Night vision	IR illumination up to 6m
IP rating	IP67
Power	AC/DC + built-in backup battery
Wi-Fi range	Up to 500m (1,600ft) line of sight
Chime	Works with Ajax sirens as chime unit

Ener-J Smart Flexi - wireless or wired video doorbell

The Ener-J Smart Flexi (SHA5357) at £49.00 + VAT runs on battery or connects to existing bell wire - the most flexible video doorbell in the range for retrofit installs where bell wire is already in place. Includes a USB chime. No hub required, no monthly fees.

1080p HD video with HDR and night vision
110-degree wide field of view - head to toe coverage
5200mAh rechargeable battery: up to 120 days per charge
Two-way audio + integrated siren
USB chime included - plugs into any USB socket

Doorbell Chimes

Standalone indoor chime units and complete wireless kits from Knightsbridge for replacing or adding a chime without a full doorbell replacement.

Product	Type	Key features	Price + VAT
Knightsbridge DC010	Complete kit (push + chime)	58 ringtones, 110dB, 150-200m, IP55 push, expandable	£17.05 + VAT
Knightsbridge DC012 Black	Plug-in chime only	Wireless mains plug-in receiver, Black finish	[VERIFY]
Knightsbridge DC013 White	Plug-in chime only	Wireless mains plug-in receiver, White finish	[VERIFY]

Doorbell Transformers

All hardwired doorbell installations require a transformer to step mains voltage down to 8 to 12V AC for the bell circuit. The most common omission on first-time doorbell orders. Stocked separately at Harbro.

Doorbell Transformers at Harbro

Low-voltage transformers for wired bell circuits, in stock at the Peterlee trade counter and available online.

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Peterlee trade counter: same-day doorbell stock

Ajax, Ener-J, Dahua, EZVIZ and Knightsbridge doorbells at 5 & 6 Whitworth Road, Peterlee, SR8 2LY. Call 0191 518 1998 to check stock. Mon-Thu 7:30am-5:00pm, Fri 7:30am-4:00pm, Sat 8:30am-12:30pm.

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Doorbells: frequently asked questions

What is a wireless doorbell?

A wireless doorbell uses a radio frequency signal between the outdoor push button and the indoor chime unit, so no cable run is needed between the two. The push button is typically battery-powered and the chime either plugs into the mains or runs from batteries. Harbro stocks wireless options from Knightsbridge, Ener-J and Ajax, covering basic chime kits through to AI video doorbells. See the dedicated wireless doorbells collection.

What is a wired doorbell?

A wired doorbell uses 2-core bell wire to connect the outdoor push button to the indoor chime, powered by a doorbell transformer stepping mains voltage down to 8 to 12V AC. No batteries to replace, no signal interference. A doorbell transformer is required for all hardwired installations. See the wired doorbells collection.

What is a battery doorbell?

A battery doorbell is a wireless doorbell where both the push button and chime are powered by batteries, with no mains wiring required. The Ener-J Smart Flexi includes a 5200mAh rechargeable battery providing up to 120 days per charge. The Knightsbridge DC010 uses standard replaceable batteries.

What is a doorbell chime?

A doorbell chime is the indoor unit that sounds when the push button is pressed. The Knightsbridge DC010 is a complete battery-powered kit including push and chime with 58 selectable ringtones. The DC012 (Black) and DC013 (White) are standalone plug-in chime receivers for pairing with an existing compatible push button.

Do I need a transformer for a wired doorbell?

Yes. All hardwired doorbell circuits require a doorbell transformer to step 230V mains down to the 8 to 12V AC required by the bell circuit. For retrofit installs with an existing transformer already in place, verify the output voltage matches the new doorbell specification before replacing just the push or chime unit.

What makes the Ajax Doorbell different?

The Ajax Doorbell is a professional-grade video doorbell from Ajax Systems, known for professional intruder alarm systems. It includes built-in AI that classifies visitors as people, animals or vehicles before alerting, a PIR sensor, IP67 weatherproofing, an AC/DC power supply with backup battery and Wi-Fi to 500m. Available in White, Black and Graphite at £149.00 + VAT.

Can a video doorbell be wired or wireless?

It depends on the model. The Ener-J Smart Flexi offers both: battery-powered (up to 120 days) or wired to existing bell wire for a continuous supply. The Ajax Doorbell requires a wired AC/DC supply as its primary power source with a built-in backup battery.

Where can I buy doorbells in the North East?

Doorbells from Ajax, Ener-J, Dahua, EZVIZ and Knightsbridge are in stock at Harbro Electrical, 5 & 6 Whitworth Road, Peterlee, Co Durham, SR8 2LY. Mon to Thu 7:30am to 5:00pm, Fri 7:30am to 4:00pm, Sat 8:30am to 12:30pm. Call0191 518 1998to check stock. Free UK Mainland delivery on orders over £70.

Doorbells

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