YA brand 219mm CE TPED 20L oxygen cylinder is made by 37Mn seamless steel pipe ,consistent height, smoothly painting, and excellent properties, which is widely used for industrial ,medical and hospital field. The products have passed TPED and CE certifica
2G/3G/4G audio door phone1. No need any wires;.2. Put sim card to use 2G/3G/4G internet to call mobile phone for intercom and unlock;3. Support Android and ISO systems.