Introducing the SAE SSU-7-CO Replacement Carbon Monoxide Sensor from Space Age Electronics, designed specifically for the SL-701 model. This innovative snap-in sensor allows for effortless replacement when it reaches the end of its lifespan, ensuring your safety is never compromised. With a built-in self-test feature that activates every 24 hours, you can have peace of mind knowing that your sensor is functioning optimally. Additionally, this unit can connect with up to 30 other sensors, making it perfect for larger setups. Don't wait until it's too late—upgrade your safety system today with the SAE SSU-7-CO and breathe easier knowing you're protected!