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 beige housing suits neutral interior finishes.

Installation is straightforward thanks to the surface-mounting design. With an 80dB output volume and IP20 protection, this doorbell is intended for indoor use where no dust or splash protection is required.

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
• Beige colour

Product Benefits

• Electromechanical design produces a natural, resonant sound distinct from electronic chimes
• Wired connection eliminates the need for batteries in the doorbell unit and avoids wireless range issues
• 8V–12V operating range is compatible with widely available low-voltage doorbell transformers
• Surface mounting means no chiselling or recessing — suitable for retrofits and rentals
• No loudness control keeps the installation simple with a fixed, clear 80dB output

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: Beige
• Dimensions (depth × width × height): 135mm × 100mm × 42mm

Why You'll Love It

• Classic DING-DONG tone is immediately recognisable and audible throughout a standard home
• No batteries required in the doorbell body — powered directly by the doorbell circuit
• Surface-mount design allows quick installation without wall modifications
• Beige finish blends with most neutral wall colours for an unobtrusive look