-WiFi501B is a high-tech product developed by our company based on Internet of Things technology. The product is widely used in food, catering, logistics and HACCP system certification industries. Through WiFi data transmission, combined with the cold chain Internet of Things platform, customers can remotely view and manage data online through a browser or smart phone wireless terminal in real time. At the same time, the platform alarm and buzzer alarm can also be used to achieve the prompt function. -WiFi501B is a temperature and humidity sensor that measures both temperature and humidity. It has a built-in 3.7V lithium battery, which is rechargeable and can still provide real-time data upload and platform alarm when the power is off. Power supply:5V/1A (DC) Battery:Built-in 850mAh/3.7V battery Measurement medium:Air Sensor range:Humidity 0%RH-100%RH Temperature -40-+125 Sensor accuracy Humidity:3%RH Sensor accuracy:0.5 Working environment:-30-+60; 0%RH-85%RH (non-condensing) Communication method:WiFi Collection interval 1 minute to 60 minutes, default 1 minute, user-definable Low voltage alarm Support, user-definable Temperature alarm Support, user-definable IP protection level:IP54 Number of storage items:20000 Appearance specification:106mmx57mmx33mm Color:As Shown Material:plastic Package Contents: 1 * Temperature and humidity transmitter 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.