DF400 Smart 

Toilet Paper Level Sensor

DF400 is a Toilet Paper detector, which can be used to detect the toilet paper remaining; when empty alarm occurs, the data will be immediately transmitted to the cloud server through the built-in module.  Users can observe status information remotely. Th

Based on low power consumption algorithm, the internal battery can work for about 1 year (report 3 times a day)  


24h Remote Monitoring

Infrared Laser

Low Power Consumption

Wireless Transmission 

High Sensitivity

Easy Installation

network diagram

Sensor →Base Station/Gateway→Cloud Server→Application



Dimension : 68x64x18mm 

Net weight : 40g 

Color : Black 

Shell material : ABS

Theory : Laser Ranging 

Measuring range : 3~200cm

Blind area : 3cm 

Accuracy of height : 3mm 

Wireless : NB-IoT / LoRaWAN / Sigfox 

Frequency :  NB-IoT: B3/B5/B8/B20/B28                                                                                      LoRaWAN:  CN470/EU868/AU915 /US915/AS923 etc                                        Sigfox: RCZ1/RCZ2/RCZ3/RCZ4   

Power supply: AA battery*2 (Battery is not included by default)

Battery Life : 1 year (3 times report per day )

Working Temperature : -20 ~ +70℃ 

Storage Temperature : -40 ~ +85℃