Jya Fjord Air Purifier Filter PRO, Triple Layer Protection, RF-ID Smart Filter, Recommended replacement for every 6 months. Jya NanoGuard Technology weaves ultra-thin organic fidre together to effectively filter 99.99% of pollutants as small as 0.1?m-the main compartment of smoke, dust, and bacteria, etc. Pre-filter - stop larger particles. NanoGuard - NanoGuard filter catches nano-level ones. Active carbon layer - locks down TVOC. RF-ID technology to identify the life of filter, remind you to when its time to replace for the best cleaning efficiency.\nModelnummer: FE7477BKGL