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Quick Details

  • Place of Origin: Guangdong, China (Mainland)
  • Brand Name: Longsin
  • Model Number: LS-858-4P
  • Usage: carbon monoxide
  • Name: carbon monoxide gas detector
  • Static current: less than 200μA
  • Alarm sensitivity: 300PPM
  • Alarm current: less than 75mA
  • Detecting target: carbon monoxide
  • Humidity: less than 95%RH
  • Operating temperature: +5℃~+40℃
  • Light: 2 led lights (red,green)
  • Battery span life: 1 year
  • Testig standard: EN50291

Packaging & Delivery

Packaging Details color box and standard export master carton. 60pcs/ctn
Delivery Time depending on quality

Smoke Detector Fire Alarm Carbon Monoxide Detector

Model: LS-858-4P


Product Description






1.A perfect item for protecting your family from the dangers of carbon monoxide.
2.Advanced level of protection, easy to read with the digital display, even in low light conditions.
3.Displays the level of carbon monoxide the unit is sensing.
4.Green LED: Flashes every 30 seconds to indicate the unit is operating properly. The green LED will also flash before CO reading is taken and when any button is pressed.
5.Red LED : When a dangerous level of carbon monoxide is detected the red LED will pulse and a loud alarm pattern will sound. The carbon monoxide alarm pattern is 4 short beeps, followed by 5 seconds of silence, followed by 4 short beeps with a corresponding red LED flash. This cycle will continue for 4 minutes and then change to 1 cycle every minute until the device is reset or the CO is eliminated.
6.Test/Reset button is designed for weekly testing if it works properly and reset the unit during CO alarm.
7.Alerts users when batteries needs to be replaced.
8.This alarm is highly recommended to be mounted on a wall surface.
9.Compact, lightweight & easy to operate.







Sensor:Electrochemical CO sensor

Sensitivity/Alarm Time:

a.Within 60~90 minutes at 50ppm CO concentration;

b.Within 10~40 minutes at 100ppm CO concentration;

c.Within 3 minutes at 300ppm CO concentration

LCD Displayer (Optional):4 digits LCD displayer
Audibility: 85dB ( at 1m distance ), Frequency 3 - 0.5KHZ
Standby Current: <50μA
Alarm Current:<50mA
Standby Mode: Green Led flashes once every 30 seconds
Alarm Mode : Red Led quickly flashes 4 times with unit chirping every 5 seconds, then repeat
Low-bat Indicator:Chirp every 30s as battery lower than 3.3V with green LED flashing and Lb on LCD
Mal-function Indicator:Chirp every 30s with green LED out and Err on LCD
Powered By: 3 x AA Batteries \


 Main Features


CO detector


LCD display

LED   indication



 Technical parameter


Operating voltage

Alarm current

Static current


Battery powered






3 x AA Batteries \





 Product Photos of Gas Leak Detector Price







Professional Manufacture.

Fire Alarms, Smoke Detectors, Gas Alarms, PIR Sensors, Carbon Monoxide Detectors, Heat Detectors, Compound Detectors,  CO Detectors, Sirens,  Strobe Lights, Door Magnetic Contacts, Electric Bells, Alarm Control Panel...all are available here.






Company Information




About our company Longsin


Established in 2006, Shenzhen Longsin Intelligence Technology CO.,Ltd. is a integration of production and trade. Our products include GSM/PSTN Alarm contral panels, smoke detectors, gas detectors, pir sensors, sirens, flashlight, manual call points, magnetic contact switchs and so on. we had passed ISO9001-2008SGS certification, most of them had approved with CE, ROHS, and were used in EU countries, Canada, USA, Australia, Malaysia, India, Vietnam, Pakistan, etc. Years of faithful of high quality of products, moderate price, efficient delivery, and professional after-sales service had kept our company reputable. Sincerely, we are looking forward to cooperating with our customers based on mutual benefits, development and enjoy the prosperity in this field.











Q:Is Longsin a factory or a trading company?

A: We are the manufacturer, industry and trade integration.  


Q:Where is Longsin?

A:Block 2, Kaijieda Industry Zone,Huchang Road, Baoan District, Shenzhen, China.


Q: Can i have a sample for testing firstly?

A: Of couse, we would like to send our items for your check before each deal.


Q: How soon can I get reply from you?

A: You can be replied immediately on trademanager and inquiry will be read and replied  within 12 hours. 




Packaging & Shipping




About The Payment 

A. T/T      B. Western Union      C. Paypal       D. Money Gram


About The Packing 

Mass Production Delivery Within 7-21 Days After Confirming The Payment.

Sample Will Be Sent In 3-5 Ddays.

Inner Box: Color/White Box(Netural) Or Specially-made As Client’s Requirements.

Outer Box: Standard Corrugated Carton, Can Print Marks.


About The Shipping 

In Bulk: By Sea Or By Air All Are Available.

Small quantity: By Air Or Wxpress(DHL,EMS,UPS,FedEx,TNT,HONGKONG post)











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The supplier’s transactions conduted via Alibaba.com in the past 6 months.
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Supplier's Trade Assurance Limit: US $59,000
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