Features Technical Parameters: Measuring output :PM2.5, PM10, Range: PM2.5: 0.0 999.9μg/m3PM10: 0.0-1999.9μg/m3, Rated voltage: 5V, Rated current: 70mA±10mA, Sleep current:<4mA Temperature and Humidity Range: Storage environment: -20℃ ~ +60℃,operation environment: -10℃~ +50℃.Humidity range: Storage environment: Max.90%,operation environment: Max.70% Interface specification: 1umPM2.5: 0-999 PWM Output, 5V 5V power input, 2.5μm PM10: 0-999 PWM Output, R Serial port receiver RX, TTL level @ 3.3V,T Serial port transmission TX, TTL level @ 3.3V. Communication protocol:Serial communication protocol: 9600 8N1. (Rate of 9600, data bits 8, parity none, stop bits 1), Serial report communication cycle: 1+0.5 seconds, Data frame (10 bytes): message header + order+ data(6 bytes) + checksum + message trailer PM2.5/10 data content: PM2.5 data content: PM2.5 (um/m3) = ((PM2.5 high byte*256 ) + PM2.5 low byte)/10, PM10 data content: PM10 (um/m3) = ((PM10 high byte*256 ) + PM10 low byte)/10.Checksum: data 1 + data 2 + ...+ data 6 Features: Accurate and Reliable: laser detection, stable, good consistency. Quick response: data update frequency 1Hz. Easy integration: serial output, built-in fan. High resolution: resolution of 0.3ug/m3. Convenient use, easy installation, and small volume. Specifications: Material: Plastic Condition: 100% brand new and high quality Weight: 60g 1.Working atmosphere pressure 86KPa ~ 110KPa&nbsp; 2.Response time 1s&nbsp; 3.Serial data output frequency 1Hz&nbsp; 4.Min. particle diameter resolution Less than 0.3um&nbsp; 5.Counting efficiency: 70%@0.3μm, 98%@0.5μm 6.Relative error ±15% and ±10μg/m3 maximum(25℃, 50%RH)&nbsp; 7.Power supply voltage 4.7~5.3V&nbsp; 8.Power supply power ≥1W（current ＞ 200mA） 9.Power supply voltage ripple ＜20mV&nbsp; 10.Product size Approx. 70 x 70 x 22mm / 2.75 x 2.75 x 0.86inch The number of bytes Name Content 0 message header AA 1 order C0 2 data 1 PM2.5 low byte 3 data 2 PM2.5 high byte 4 data 3 PM10 low byte 5 data 4 PM10 high byte 6 data 5 ID byte 1&nbsp; 7 data 6 ID byte 2 8 checksum checksum 9 message trailer AB The low byte and high byte of SN are the last four of the bar code on the sensor. PWM output: Output range: PM2.5: 0-999μg/m3, PM10: 0-999μg/m3 Cycle: 1004ms +1% High level output in start cycle: 2ms Middle cycle: 1000ms +1% Low level output in end cycle: 2ms Package List 1 x Laser Dust Sensor 1 x USB To TTL Module 1 x Cable Package List