The portable voice type single and mutil gas detector (hereinafter referred to as detector) is a safety device that can continuously detect the concentration of leaked gas . Advanced integrated circuit technology , embed with microcomputer control , high quality imported gas sensor , excellent sensitivity and excellent repeatability, using dot matrix LCD monitor, support Chinese and English interface and voice alarm , users can quickly understand this product, easy to use and maintain , high strength , high-grad shell , dust proof , waterproof and explosion-proof.