Henan Hanwei Electronics Co. Ltd

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Explosion-proof Acousto-optic Annunciator	CO and CH4 alarm with 2 sensors for detecting CH4 and CO	Economic Gas Leak Alarm with High-quality Flat Surface Sensor	Portable Single Gas Detector with Pump and Low Power Consumption Features
Coin-operated Vending Breathalyzer with Fuel Cell Sensor and Four-digit Display	Carbon Monoxide Alarm Sensor with LCD Display and 3V DC Power Supply