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Buzzer is an integrated structure of the electronic sound device, the use of DC voltage power supply, widely used in computers, printers, copiers, alarm, electronic toys, automotive electronics, telephones, timers and other electronic products for sound devices The Buzzer is mainly divided into piezoelectric buzzer and electromagnetic buzzer two types. The buzzer is indicated by the letter "H" or "HA" (old standard "FM", "ZZG", "LB", "JD", etc.) in the circuit. Can be wave soldering, R / TMB-09-A for this specification environmentally friendly products model. Working time ≥ 1S; welding temperature: environmental protection ≤ 230 ℃, non-environmental protection ≤ 210 ℃; welding time ≤ 2S