ZH serial Chemical Oxygen Self-Rescuer is a kind of closed-loop circulating respiration protecting device. It makes the exhaled air react with the chemicals to produce oxygen.

ZY serial Compressed Oxygen self-rescuer is a kind of lsolation type closed circuit individual respiratory system protective device that use compression oxygen as gas source.

ZL serial filter self-rescuer is a kind of portable breathing protective device especially to filter and convert CO into CO2 for underground coal miners