ABC - Electro Mechanical Buzzers. The ABT-407-RC/RS is a small, low profile electro mechanical transducer housed in a Noryl plastic casing. These buzzers have a minimum sound output of 70dB at 10cm and can be used in a wide -20 °C - +70°C operating temperature range. Features ; Benefits. Small, low profile electro mechanical transducer Housing material: Noryl -20 °C - +70°C operating temperature range Minimum sound output is 70dB at 10cm