The SPD-2P is a sound transducer and signaller manufactured by MPM. It is equipped with a built-in generator and is rated at 1mA. The device is used in various applications, such as fire alarm systems, public address and warning systems, burglar and intruder alarm systems, access control systems, and industrial machinery alert systems. Additionally, its sound output is adjustable with a wide variety of sound levels available. The SPD-2P also comes with a variety of input and output connections, including an access control, relay, alarm and door strike terminals. It is designed to be highly reliable and long lasting, and is certified for safety and compliance.