The SD-45150H20 is a Standard Receiver compatible with almost any G-style handset. It features a vandal resistant cover designed for long, durable use with payphone handsets.

- DC Resistance at 20 degrees C : 145 ± 15 ohm
- Frequency Response Range: 300-3400 Hz
- Sensitivity: 100 ± 2 dB at 60mv
- Impedance: 150 ± 30 ohm at 1 KHz
- Weight: 60 grams
- Dimension: (Ø) 45 x 22 mm