The Dinsafer Helio DOSH4 is a wireless outdoor siren built as an accessory for the Helio smart alarm system. Its 115 dB output at 30 cm is designed to be heard at distance and deter potential burglars. A red lens with configurable prompt-tone and light settings adds a visible alarm indicator.

The siren uses three D (LR20) backup batteries included in the box, with up to 36 months of standby time depending on usage and battery quality. An optional DC 12 V external power supply can supplement or replace the batteries. The anti-tamper function and core microprocessor protect the unit against physical interference. When the battery is low, the Helio app sends a replacement notification to the user.

Key Features

• 115 dB siren output at 30 cm
• IP54 weather protection for outdoor use
• Anti-tamper protection
• Backup battery: 3 × D (LR20), up to 36 months standby
• Optional DC 12 V, 1 A external power supply
• Wireless transmission at 433.92 MHz, up to 1000 m without obstacle
• Configurable prompt tone and light indicator (red lens)
• Low battery app notification

Product Benefits

• 115 dB output at 30 cm is sufficient to alert neighbours and discourage entry without additional amplification
• IP54 rating protects the electronics from dust and splashing water, allowing permanent outdoor mounting
• 36 months battery standby removes dependence on mains wiring for the backup supply
• The anti-tamper alarm triggers if the unit is forcibly opened or removed from its mount
• PC+ABS+Anti-UV housing resists UV degradation, extending outdoor service life

Technical Specifications

• Model: DOSH4
• Power Supply: DC 12 V, 1 A (optional)
• Backup Battery: 3 × D (LR20) dry cell (included)
• Battery Standby Time: 36 months (depending on usage and battery quality)
• Transmission Distance: Up to 1000 m (without obstacle)
• Standby Current: ≤110 μA
• Working Current: <450 mA
• Siren Volume: 115 dB @ 30 cm
• Lens Colour: Red
• Working Temperature: -20°C to +60°C
• IP Grade: IP54
• Tamper Protection: Supported
• Housing Material: PC + ABS + Anti-UV
• Dimensions (L×W×H): 277.5×234×75 mm

Why You'll Love It

• The three D-cell batteries are included in the box — the siren is ready to mount and pair without a separate battery purchase
• Visible red-lens strobe provides a clear alarm indicator even in daylight, supplementing the audio alert
• The Helio app replacement reminder means the backup battery is never silently depleted between manual checks
• Pairs with the Helio ecosystem: the main panel controls activation automatically when any sensor in the system is triggered