Free Shipping & 30-Day Free Returns
US-Based Fast Shipping
Ships Same Day · Arrives in 3–7 Days
★★★★★ 4.8 · 2,140 Ratings · 10,000+ Sold
2-Year Warranty + 5-Year Sensor Life
RoHS Compliant
Most household CO alarms are designed to remain silent at low readings. The VASAIKO HD16 adds another layer of awareness by displaying live CO levels from 0–999 ppm, refreshed every 2 seconds.
It also brings combustible gas, smoke, temperature and humidity information together on one easy-to-read color screen—so you can understand more of what is happening around you.
Key points:
Add the Missing Layer
HD16 helps you monitor more than carbon monoxide. Its color display brings five important readings and alerts together in one place:
Instead of relying only on an alarm tone, you can view the current CO level, temperature and humidity at a glance. Built-in battery backup completes the 6-in-1 monitoring system, helping the device continue operating when AC power is unavailable.
HD16 uses an electrochemical CO sensor to display readings across a 0–999 ppm range. The displayed value refreshes every two seconds, making it easier to notice changes and monitor trends over time.
The bright 2.8-inch color screen clearly presents CO concentration, gas and smoke status, temperature, humidity, battery level and alarm condition—all without opening an app.
Use the standard AC adapter for continuous monitoring at home. When portability matters, detach the monitor and attach the included magnetic adapter.
Simple One-Button Status CheckA short press of the test button initiates the device’s self-check sequence, allowing you to confirm its audible, visual and status functions before use.
Clear power, fault and alarm indicators make routine status checks straightforward—without complicated setup or app pairing.
For best results, test the unit regularly and follow all installation, placement and maintenance instructions included with the product.
The built-in 1,000mAh rechargeable battery provides approximately eight hours of backup operation, making HD16 useful during short power outages and for temporary monitoring away from an outlet.
Suitable locations include:
HD16 is a supplemental monitor intended to provide additional environmental awareness. It is not a substitute for UL 2034-listed carbon monoxide alarms, UL 217-listed smoke alarms or other devices required by state and local codes. Keep all required alarms installed and properly maintained.
Free US Shipping
Free shipping across the US, with no minimum order. Orders ship the same day from our local warehouse and typically arrive in 3–7 days. We'll email your tracking link as soon as your order leaves the warehouse.
30-Day Free Returns
If it's not the right fit, return it within 30 days of delivery for a full refund — no restocking fees, no questions asked. Just email us and we'll take care of the rest.
2-Year Warranty · 5-Year Sensor Life
Every VASAIKO detector is individually inspected and tested before it ships, and covered by a 2-year warranty with a 5-year sensor life. If something goes wrong, email us and we'll make it right.
Real Support, Real People
Our product team — not bots — answers setup, placement, and order questions, usually within 24 hours on business days. Email us at support@vasaiko.com.
Real answers to the questions families ask us most about CO protection.
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