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Set UHF receiver and spy transmitter external microphone

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  • Model: LMUHFR9S
  • Shipping Weight: 0.05lbs



The set LM-UHF contains a high quality UHF audio surveillance combination. It including one covert transmitter and one professional receiver, both of them working on a fixed point of UHF band. The UHF transmitter is featuring a long external microphone, using a 9V battery and the sensitive UHF-433 PLL receiver Ver. 1. The transmitter can be easier concealed due to the external microphone.
The professional spy UHF audio listening device transmit crystal clear voice up to 600 meters away, line of sight. The UHF receiver can pickup voice signals within 600 meters line of sight area.  You can connect voice recorder to UHF receiver.
We are adjusting each set to a 100% matching frequency. This set is using only high grade components, and one of the unique receiver features - listening to the conversation and recording at the same time, if it is connected to a recorder.
The PLL UHF CRYSTAL STABILIZED RECEIVER can be used in a room or business, indoor or outdoor. It employs a high sensitivity circuit which allows the user to pick up RF NFM Transmitters from 200m in urban areas and up to 600 m and even more on straight line (Line Of Sight).




  • Working Voltage: 9V alkaline battery (not included)

  • Dimension: ONLY 2 X 5.5 X 8.7 cm .

  • Receiver's frequency range: 433.8-433.9MHz

  • This is an ORIGINAL crystal controlled NFM PLL UHF receiver.

  • Double Superheterodyne - PLL

  • Sensitivity: Better than –125 dBm into 50 Ohm (12 dB/sinad).

  • Less current drawing than any similar device - due to new components.

  • It uses a special antenna, only 14cm.

  • SMD built, for more stability and range (MIL SPECS 1% accuracy)

  • Sensitivity: Better than –125 dBm into 50 Ohm (12 dB/sinad)!

  • Deviation: ~ 2.5 KHz to 6 KHz !!!

  • Sockets for audio recording and earphones.

  • The battery lifetime depends on the battery freshness and brand.

  • External DC jack.

  • PROFESSIONAL PLATED BOARD FOR EXTRA STABILITY. There is NOT oxidation and dry soldered joints during the time due to the coating material.

  • The Receiver comes FULLY ASSEMBLED AND READY TO USE, Just connect it and start listening.



  • Working Voltage: 9V

  • Board Dimension: only 1cm x 2cm!

  • External miniature microphone (4 mm diameter on a 5 cm thin cable).

  • Transmitter's frequency range: NFM (UHF) 433.6-433.9MHz FIXED MAINTENANCE FREE CRYSTAL.

  • Long transmitting range: up to 600 m on clear. (L.O.S).

  • SMD built, for more stability and range (MIL SPECS 1% accuracy).

  • EXTRA amplified output!

  • Using a mil.specs. material for encapsulating, for safety and security.

  • The device is coated with special Anti-static material.

  • Penetrates through walls and ceilings.

  • Sensitive FET microphone, you can listen to a whisper approx. 30sq.ft (100sq.m) radius , crystal clear. You won't miss a word.

  • Professional gold plated board for extra stability.



  • 1 Set Crystal controlled PLL Crystal controlled receiver and LM_UHF transmitter.

  • 1 Instructions Manual.