Comparison : Item # SMT-0821-T-R, 120 Milliampere (mA) Maximum Rated Current, 16 Ohm (?) Coil Resistance, and 2100 Hertz (Hz) Resonant Frequency Transducer
Item # SMT-0823-S-R, 70 Milliampere (mA) Maximum Rated Current, 32 Ohm (?) Coil Resistance, and 2300 Hertz (Hz) Resonant Frequency Transducer
Item # SMT-0825-T-2-R, 90 Milliampere (mA) Maximum Rated Current, 15 Ohm (?) Coil Resistance, and 2700 Hertz (Hz) Resonant Frequency Transducer
Item # SMT-0825-T-R, 90 Milliampere (mA) Maximum Rated Current, 15 Ohm (?) Coil Resistance, and 2500 Hertz (Hz) Resonant Frequency Transducer
Item # SMT-0826-S-R, 90 Milliampere (mA) Maximum Rated Current, 15 Ohm (?) Coil Resistance, and 2630 Hertz (Hz) Resonant Frequency Transducer