Carbon Monoxide Alarm HD11-C

Carbon Monoxide Alarm HD11-C, presented in its original retail packaging. This compact monitor features a digital display showing CO concentration in ppm, with additional temperature and humidity readings, plus audible alarm functionality. Its portable design and built-in rechargeable lithium battery make it suitable for domestic, travel or workshop use.

• CO measuring range: 0–999 ppm (±5%)
• Temperature range: 10°C to 50°C / 14°F to 122°F (±3%)
• Humidity range: 5%–95% RH (±5%)
• Built-in 2000mAh lithium battery
• AC 100–240V, 50/60Hz power supply; 5V/1A maximum working input
• Approximate dimensions: 120 × 65 × 25 mm
• Box contents stated as: alarm, power plug, magnet cap and user manual

The unit appears well preserved and remains boxed; the packaging shows minor handling/storage marks consistent with presentation.