Ningbo Joiwo explosionproof technology Co., LTD was eastablished in May, 2011. with the shrinkage of pulic telephone market, and with the advantages of our many years' experience in public telephones and industrial telephones, we enter industrial telephone field and register Joiwo as our trademark. Wih its strength of researching and developing, producing and providing products, we develope and design all of our items and are applying patents for our new designs. Our products are widely used in manufacturing sites of steel, vessel, petroleum and chemistry etc.. waterproof grade of all of our telephones reaches IP67.