1. CH4, CO, O2, H2S gas detector 2, provide OEM, ODM 3. a full set of service from design, mold ... ABS, PC, PE, PA, Nylon66, etc.3. Offer OEM & ODM service.4. All kinds of plastic box, plastic cases, ... .2) Professional mold design and making injection mould.3) We have the professional work teams and strict ... and long-term relationship with you. Portable 4 in 1 gas detecting alarm design and produce