Micro buzzer housed in small package

CUI CMT‑4023S‑SMT and CMT‑5023S‑SMT magnetic transducer buzzers are housed in compact, surface mount packages as small as 4mm x 4mm. Devices come with profile depths as low as 1.9mm and sound pressure levels (SPL) ranging from 65dB up to 80dB at 10cm. Both devices provide a low profile of 2mm, a rated voltage of 3V and a rated frequency of 4kHz. CMT‑4023S‑SMT carrys an SPL of 70dB and an operating temperature range of -20C to 70C. CMT‑5023S‑SMT provides an SPL of 80dB with an operating temperature range of ‑30C to 70C. http://www.cui.com/product/components/buzzers/audio-transducers/magnetic/cmt-4023s-smt