<p>Common Display screen</p> <p>Test variables: carbon dioxide (CO2), temperature, humidity</p> <p>Large 2200mAh capacity Lithium battery</p> <p>5V Micro-USB charging</p> <p>Low battery warning</p> <p>Specifications:</p> <p>Display : Common Display Screen</p> <p>Pressure: 86Kpa - 106Kpa</p> <p>Sampling time: 1.5 seconds</p> <p>Storage temperature: -10 c to 60 c;</p> <p>CO2 Concentration Unit: PPM</p> <p>Power source: Lithium battery with a capacity of 2000mAh;</p> <p>DC 5V power supply via micro-USB port</p> <p>Instructions:</p> <p>1. Start</p> <p>When you long press the power button, the air quality monitor will start.</p> <p>2.About Charge</p> <p>When the low battery is displayed, the device needs to be . Insert the included or another compatible Micro-USB charging cable into the device. Attach the other end to a USB DC charger (such as a smart phone charger) which outputs DC 5V at more than = 1000mA. Charge fully for at least 2-3 hours before use. Avoid charging with a USB computer port which only outputs 500mA.</p> <p>3. Parameters</p> <p>Carbon Dioxide Monitor Indicators</p> <p>Measuring range: 400-5000PPM</p> <p>Resolution: 1 PPM</p> <p>Measuring range: -10-50 c</p> <p>Technical temperature and humidity indicators</p> <p>Humidity range: 20% -85% RH</p> <p>Measurement accuracy: +\/- 1 c</p> <p>Measurement accuracy: +\/- 4% rh</p> <p>CO2 sensor: infrared (NDIR)</p> <p>Colour: black</p> <p>Material: ABS</p> <p>Package Contents:</p> <p>1 * Air Quality Monitor</p> <p>1 * English manual</p> <p>Only the above package content, other products are not included.</p> <p>Note: Light 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.</p>