Specifications:- Air Velocity: Range: 0 - 30m/s, 0 - 90km/h, 0 - 5860ft/min, 0 - 65mph, 0 - 55Knots Resolution: 0.1m/s, 0.3km/h, 19ft/min, 0.2mph, 0.2Knots Threshold: 0.1m/s, 0.3km/h, 39ft/min, 0.2mph, 0.1Knots Accuracy: +/- 5% Air Temperature: Range: -10 - 45degree, 14 - 113F Resolution: 0.2degree, 0.36F Accuracy: ±2degree, ±3.6F Power Supply: 1 * 3V CR2032 battery Thermometer: NTC Thermometer Operating Temperature: -10~45degree (14~113F) Operating Humidity: less than or equal to 90%RH Storage Temperature: -40~60degree, -40~140F Current Consumption: About 3mA Item Size: 105 * 40 * 18mm Item weight: 50g Powered by a 3V CR2032 battery. Package including:- 1 * Digital Anemometer 2 * 3V CR2032 Battery 1 * Lanyard 1 * User Manual