The GF0401M is a compact 40 mm round speaker designed for low-power audio applications. It features a ferrite magnet, mylar cone, and PET pads for terminal connections, delivering a sound pressure level of 121 dB at 1 mW. The speaker operates across a frequency range from its resonant frequency of 180 Hz to 20,000 Hz, with an impedance of 8 O at 1.0 kHz and typical input power of 0.04 W. With dimensions of Ø40 × 9.3 mm and a weight of 17.8 g, it is suitable for portable devices, alarms, and notification systems requiring compact audio output. The device is RoHS compliant and operates reliably over a temperature range of -25°C to +60°C.