Proskit MT-8001 Butt Set


Proskit MT-8001, Butt Set


Recognized as the new industry standard, the MT-8001 butt set provides superior quality at an affordable price. With its high impedance monitor for data safe operation, technicians can clip onto a line in Monitor mode without disrupting existing traffic. Prokit’s unsurpassed protection standards and durability assure the butt set will keep working even in the toughest environments. New weatherproofing provides enhanced resistance to severe weather conditions.


  • Built-in amplified speaker provides three audio levels for hands-free listening.
  • Functional tone and pulse mode are applied to the most telephone system.
  • Store up to twelve, 16-digit telephone numbers on speed dial.
  • Pre-dialing and last number redial operation save up to 32-digit telephone number
  • Advanced PBX pause function easily inserted between digits of a stored number
  • High-impedance monitor mode design provides minor noise output while operating.
  • Equipped with the mute switch to turn off the speakerphone microphone for privacy.
  • Continuous polarity LED indications, easy to verify and detect the current connection status.
  • Power saving function automatically shut down after 5 minutes of inactivity, providing longer operating time.
  • Audible electronic ringer in 3 level volume controls.
  • Ergonomic and lightweight design, enjoy unparalleled mobility and reliability.
  • Used as a regular telephone while positioning the “Talk/Monitor” switch in talk mode.
  • Product does not contain batteries.


Loop limit2 kΩ maximum at 48 VDC
(nominal 20 mA minimum loop current)
DC resistance
Talk mode300Ω typical
Monitor impedance39kΩ nominal at 1 kHz
Rotary dial output
Pulsing rate10pps+0.8pps
Percent break61%±2%
Interdigit interval1000 ms typical
Leakage during break>50 kΩ
DTMF output
Tone frequency error±1.2% maximum
Tone level-8±2dBm combined(typical)
High versus low tone difference4 dB maximum
Memory dialing
Memory capacity12 memories plus last number redialing
Digit capacity16 digits per memory
PBX pause duration4 seconds
Monitor amplifier power source9V transistor; provides 25 hours continuous use, typical
Speaker levelsLow, medium, high
Automatic power shut offAfter 5 min. of no audio signal
Speaker phone levelsLow, medium high
Power sourceShared line and battery power
Length10-1/4 inches(26.0 cm)
Width2-3/4 inches(7.0 cm)
Height3-1/2 inches(8.90 cm)
Weight560 g typical
TemperatureOperating:0 to 50˚C
Storage:-40 to 66˚C
Altitude relative humidityTo 10,000 feet 5 to 95%