Pressure Calibration: Supports manual calibration for improved accuracy

Compatible with iPhone and Android models

The manual volume control allows easy adjustment according to different surroundings

There are bubbles in the glass

Product Information:Measuring Range: 400–5000 PPMMeasuring Object: AirMeasurement Accuracy: ±3 PPMResolution: 3 PPMVoltage: 5VProduct Size: 80 × 50 × 80 mmPower Supply: USB + Rechargeable Lithium BatterySensor Type: Infrared CO₂ Sensor with Color Display

Socket Fan with Remote, Adjustable Screw Mouth Intelligent RC Integrated LED Fan Light Color:White Pressure Calibration: Supports manual calibrationOverview: Ceiling Fan with LED Light: Socket Fan by Bell + Howell allows you to get two uses out of one standard electric socket. The Socket Fan is both a ceiling fan and a super bright LED bulb in 1 unit, so you can illuminate and circulate air around your room without spending for two different products Super Bright and Warm: 1,000 Lumens of super bright light will illuminate any dark room around your home; Warm light models come with 3500 warm