4 cm (1.6") miniature speaker with plastic diaphragm  (Mylar) and metal basket. Thanks to its compact dimensions, suitable for  signal output in machines and other equipment where space is at a  premium.
 
Technical Data:
| Rated power | 0,5 W | 
|---|
              | Maximum power | 1 W | 
              | Nominal impedance Z | 8 Ohm | 
              | Frequency response | 300–20000 Hz | 
     
                        | Mean sound pressure level | 82 dB (1 W/1 m) | 
              | Resonance frequency fs | 520 Hz | 
              | Voice coil diameter | 13,7 mm | 
              | Height of winding | 1,8 mm | 
              | Cutout diameter | 35 mm | 
              | Net weight | 0,014 kg | 
              | Protective system | IP 65 *) | 
              | Temperature range | −25 ... 70 °C |