Buzzers are typically used in residential construction and non-residential construction, offices, banks, etc. They are used to send alarm signals or to send general acoustic signals. These devices are used as service insRead more

Mini-lens 50 mm, 1: 2.8 PENTAX C5028-M (KP) with fixed Focal distance, aperture and focus Adjustable D=29.5 mm, L=38 mm