Features : Integrated detection with NH3/Temperature/Humidity Built-in auto calibration algorithm to enhance sensibility and save Exceeding Alarming with auto detection and auto measuring if people do not like alarm sound ,people can turn it off by pressing the power button 2 times easy operation History Records save, 3.5 inch LCD display NH3 Sensor technolology :Electrochemistry sensor Temperature unit between Celcius and Fahrenheit Switch -24 hours real time monitoring. Detection range: NH3 ( 0-50ppm) Power supply:rechargeable Li-battery 2000mah includding USB Chargeing cable Material:ABS Product Size:130 x 80 x 30MM Color: As Shown Package Contents: 1X Air Quality Monitor 1X USB charging cable 1X manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: 1.Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2.Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 1318 hours Hope you have a pleasant shopping experience!