Features:

1. Loud 85 decibel alarm.
2. Permanent carbon monoxide sensor.
3.Powered by 3 x 1.5V AA batteries. (not included)
4.After 3 minutes when connected with battery the detector enter into the work mood. (Please kindly note: If the detector not in this mood, there is no response for co gas test.)
5.The alarm sound pattern is four short alarm beeps. The red LED will flash while in alarm mode.
6.One 'chirp'every 30 seconds is an indication that the battery is low (need replacement)(red LED still flashes once every 30 seconds) or the unit is malfunctioning (red LED si out.)
7.Alarm memory feature: If the unit ever alarms, pressing the button,red LED will flashes once every second for one minutes and the peak alarm level will indicate on the LCD.
8.Test/Reset button to test the unit electronics and verifies proper unit operational and reset the unit during CO alarm.
9.Red LED lights that indicate normal operation and alarm status.
10.3 digits LCD displayer is optional.'Lb'on the LCD to indicate it low battery and need replacement.'999ppm. on the LCD to indicate CO level over 999ppm. If the Co leakage is less than 999ppm but over 30ppm, it would show its actual concentration.
11.The unit will sound 'chirp' and red LED flashes once as power up.
12.Power saving feature:The alarm sound pattern is 4 beeps every 5 seconds for the first 4 minutes. In 4 minutes, it will change to 4 beeps every minute to save the battery.