Piezo speaker drivers/receivers are not a specific brand but a category of components used in various industries. These devices, typically made from piezoelectric materials, convert electrical signals into sound (speakers) or sound into electrical signals (receivers). They are widely used in electronics, automotive, medical devices, and industrial applications. Leading manufacturers of piezo components include Murata Manufacturing Co., Ltd. (Japan), TDK Corporation (Japan), and Piezo Technologies (USA). These companies produce high-quality piezo speakers and receivers for applications such as alarms, ultrasonic sensors, and audio feedback systems.