MLT‑9055 is HNDZ SMD‑type passive electromagnetic buzzer, direct drop‑in replacement for traditional 09‑series through‑hole pin buzzer. Same acoustic performance as pin‑mount 09 series, upgraded from pin‑through‑hole assembly to SMD surface‑mount solution. Eliminates manual pin‑insertion soldering, fits fully‑automatic SMT reflow production, improves production yield & saves PCB layout space. RoHS & REACH compliant, ideal for mass‑produced consumer electronics, household appliances, control panels and alarm modules