Based on this product's specifications, here are some alternatives and similar models
Gas and Carbon Monoxide Detector install base FA3820 — built-in lithium battery, certified
Summary description:
The install base FA3820 is a certified gas and carbon monoxide detector with a built-in lithium battery. Designed for continuous indoor monitoring, it detects hazardous gas and CO levels and provides audible/visual alerts. Suitable for homes and small commercial spaces, it ensures early warning to help prevent poisoning and gas-related incidents. Easy to install and intended for reliable everyday safety monitoring.