The Orno 139 is an electromechanical doorbell that produces a two-tone DING-DONG sound. It operates on a 50Hz AC supply in the 8V–12V range, making it compatible with standard low-voltage doorbell transformers. The white housing suits most interior wall finishes.

Surface mounting means the unit attaches directly to the wall without recessing or chiselling. With an 80dB output volume and IP20 protection, this doorbell is designed for indoor locations where no dust or splash protection is needed.

Key Features

• Electromechanical operation producing two-tone DING-DONG sound
• Wired connection — no wireless signal interference
• Nominal voltage: 8V~12V AC at 50Hz
• Sound volume: 80dB
• Surface-mounting installation
• IP20 degree of protection
• White colour

Product Benefits

• Electromechanical design produces a natural resonant tone that carries clearly through rooms
• Wired connection removes the need for batteries in the doorbell body and avoids wireless range limitations
• 8V–12V operating range works with standard low-voltage doorbell transformers already installed in most homes
• Surface mounting enables quick, non-invasive installation — no wall damage required
• Fixed 80dB output with no loudness control keeps setup simple

Technical Specifications

• Model: Orno 139
• Type: Electromechanical
• Sound: 2 tones (DING-DONG)
• Volume: 80dB
• Nominal voltage: 8V~12V, 50Hz
• Type of transmission: Wired
• Installation: Surface mounting
• Loudness control: No
• Degree of protection (IP): 20
• Colour: White
• Dimensions (depth × width × height): 135mm × 100mm × 42mm

Why You'll Love It

• Classic two-tone chime is immediately recognisable and audible throughout a standard home
• No batteries needed in the doorbell unit — powered directly from the wired circuit
• Surface-mount design allows fast fitting without drilling deep into walls
• White finish integrates cleanly with painted or tiled indoor walls