The PowerTag Ambient A9XST114 temperature sensor is primarily used to measure the temperature of food storage and processing equipment and rooms to maintain the cold chain. The operating frequency for wireless radio transmission is 2.405 GHz and the maximum transmission range in the open field is 100m. The measurement and transmission time is 2 minutes. The measuring range and the operating and storage temperature is -30 - 55 °C. The maximum humidity during operation and storage is 95% RH. The accuracy is ±1°C. The power is provided by the built-in battery, so the device should be replaced after 2 years to maintain full functionality. Mounting with double-sided adhesive tape, clamp or screw, IP 65. Dimensions (HxWxD) 15mm x 40mm x 40mm. The PowerTag Ambient temperature sensor is supplied as a set, which contains 4 pieces.