Youshiko C0 9400 Air Quality Monitor with Wireless PM2.5 / PM10 Sensor

Clear and easy use air quality monitor / MSF UK version RC clock with DST time updated / Alarm and snooze function PM2.5 / 10 reading / AQI with level indicator / 1 hour and Past 24-hour Max records / AQI Hi alert setting Indoor temperature (°C/°F) & humidity readings display / Wireless sensor battery level indicator / Amber LED backlight Support up to 4 pcs PM2.5 ( 1 x YC74 Sensor included ) Main clock unit Wall mount/ desktop usage / Power: 2 x AA (not included) Product size: 90 x 103.5 x 34.5 mm (W x H x D) (with stand) / Display VA size: 69 x 64 mm (W x H) High precision PM 2.5 / PM10 sensor / LCD display to show detected value and 24hr PM2.5/PM10 level Battery power level indicator / Using rechargeable batteries and/or USB power YC74 sensor : Long-range transmission with console up to 150m (450 ft.) Power: USB power and 3 x AA 1.2V rechargeable batteries (included) Product size: 82 x 120.5 x 41 mm (W x H x D) / Display VA size: 37 x 21mm (W x H)