This product is designed with all domestic electronic components. The main control MCU and sensor support ultra-low power consumption. In addition, a three- acceleration sensor is added for vibration detection to achieve screen sleep or wake-up, further effectively reducing product power consumption Ultra-long battery life: Laboratory tests show that 150mA lithium batteries can work continuously for more than 6 months; Temperature and humidity calibration: It has been integrated into the software algorithm, and users do not need to perform secondary operations, which is simple and convenient Lithium battery rechargeable: With intelligent charging management chip (it is recommended to fully charge the first time, and the charging process is also the process of automatic calibration of the product. Data fluctuations are normal) Specifications: Sensor Model: NSHT30, SC7A20H. MCU Model: PT32L076. High Precision: Temperature Sensor 0.3 Working Range: -40~125. Humidity Sensor 3%RH Working Range: 0%RH ~100%RH Button Description: REST is the reset screen key. After pressing, the screen displays all 0s. After waiting for 5 seconds, it return to normal display; KEY1 screen refresh button. The screen refreshes once every 5S by default. You can refresh in real time by pressing the KEY1 button; KEY2 is the vibration detection (3D acceleration) on and off control key. The factory default state is off. If you need to turn it on, and hold KEY2 for 3S to turn it on. After turning it on, if no vibration is detected for 5 consecutive minutes, the product enter the automatic screen off state (in this state, the temperature and humidity sensor and MCU still work normally), and then it automatically light up after detecting vibration, or it can be restored to light up by pressing the KEY2 button; if you need to turn off the vibration detection function, and hold KEY2 3S automatically shut down; Precautions for use: 1. Do not place the product in a high dust environment (it is easy to block the sensor detection window, causing inaccurate detection data); 2. Do not use the product under direct sunlight; 3. Pay attention to waterproofing during use. Electronic products may be short-circuited and damaged when exposed to water; Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Color: Black Material: PCB Package Contents: 1 x Sensor 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.