TopTes Guard-756 Upgraded Oxygen Detector, Portable O2 Monitor, 0.5s Fast Response, Rechargeable O2 Gas Detector, with Vibration, Visual & Sound Alarms, Dust and Explosion Proof, for Work, Home-Orange

Precise Sensor with 0.5-Second Quick Response: The Guard-756 upgraded O2 monitor features a DDS sensor that triggers an alarm within 0.5 seconds when oxygen levels reach the preset threshold, continuing until levels return to safe. The upgraded sensor offers longer life, greater accuracy, and high resolution. Detection range: 0-30% VOL
7-Day runtime & 4-Hour Quick Charge: The oxygen detector is equipped with a robust 2000mAh battery that charges fully in 4 hours, offering up to 7 days of operation on a single charge. It includes a real-time battery indicator, and a low-battery alert activates automatically when power falls below 10%, ensuring uninterrupted monitoring and protection
Triple Alarms: The Guard-756 oxygen meter features three alarm modes: LED light, vibration, and sound. After an alarm, it automatically logs data for tracking and safety, with a capacity of up to 999 records. Its sensor is located at the top of the device, minimizing the chance of airflow blockage by the hand when held or worn, and reducing the risk of contamination from hand residue or dust