【Battery-Powered & Easy Installation】Operates on 3 AAA batteries (not included) with low power consumption for extended standby time. Portable and easy to install in homes, cars, or carry during travel and camping 【Instant Alert & High Precision】Advanced electrochemical CO sensor provides high-accuracy alerts. Loud 85dB alarm for immediate warning when dangerous levels are detected 【Smart Alarm Standards】Alerts within 60-90 minutes for 50-99 ppm, 10-40 minutes for 100-299 ppm, and instantly for 300+ ppm CO levels 【LCD Display & LED Indicators】LCD screen shows CO levels above 50 ppm. Color-coded LED indicators: Green for normal operation, Yellow for malfunction, and Red for alarm state 【Portable and Easy to Install】Designed for convenience, this detector can be effortlessly installed in homes, vehicles, or taken along for outdoor activities like camping. Its compact design ensures portability and reliability wherever needed Specifications: Sensor type: electrochemical carbon monoxide sensor Battery power supply: 3*AAA 1.5V batteries (not included) Display: LED digital display Alarm indication: LCD display, sound and light prompt Standby current: <30uA (with LCD) Alarm current: <40mA Alarm sound: 85dB Working environment conditions: -10~ +55℃, ≤95%R.H. Detection level range: 0~999PPM Error: +/- 3PPM