bad breath checker

7501A Mini 3 Level LED Halitosis detector ( V1.00 ) 1、 Features 1) By HIG high-performance 8-bit microcontrollers (12 bit A / D) control, the MEMS sensor for the SM bad breath gas sensor (H2S); 2) Seven Color; 3) Single-button operation; 4) 3 files LED visual display, with low-voltage directive function; 5) At the top of a small high-brightness LED lighting; 2、 Technical Parameters 1) Show value: 3 LED display (green, yellow and red); 2) Test range: Ⅰ ~ Ⅲ level; 3) Warm-up time: 8 seconds; 4) Response time: ≤ 5 seconds ; 5) Recovery time: ≤ 15 seconds; 6) Alarm range: ≥ Ⅱ bad breath when the alarm, buzzer alarm; 7) Input power: DC 3V (CR2032 button ×1) 8) Products Size: 50 × 31 × 8.5mm3