Smallest spy ear piece receiver


Spy micro ear piece / in-ear receiver in UHF band, for discreet long distance communications, with no neck-loop needed


UHF smallest in-ear receiver – new type of spy ear piece !

Ultra-secret one way UHF FM spy ear piece / in-ear receiver, this is total invisible in the ear, used for covert communications and surveillance.

Key benefits:

  • Smallest spy micro earpiece in-ear Receiver ever made, that enters completely in the ear canal, without anyone to see it.
  • The working distance is 200 meters in open field.
  • The spy micro ear piece, MRF400-B in-ear receiver, has a black coat, for a better invisibility in the ear canal – the perfect camouflage, imitating the darkness in the ear.
  • No neck-loop needed! No accessory on your body!
  • Undetectable for any detector!
  • Non jamming by any phone jammers!
  • No interference with any electromagnetic fields!
  • No billing for your conversations
  • Instant communication, without waiting calls or conditioned by the phone network
  • Secret communication! your conversation will not be taped by phone operators and no leads to your location

What is it for:
This covert communication system can be used in various situations, like public speeches, TV presenter speaking, surveillance, presentations or to cheat on the hardest exams.

How it works:
If you need to have a covert communication, all you have to do, is to put the spy earpiece into your ear canal, in order to hear your partner. Your partner can be at a distance of up
to 200 meters in open field or less (in a building area). Like the MRF400-C  spy ear piece receiver, it doesn’t need any wires or accessories on the body, making it a champ of all earpieces on
the market.

Technical specification for MRF400-B spy Micro Earpiece UHF FM Receiver:

  • Dimensions: 10 x 6 x 6 mm
  • Receiver mod: narrow-band RF receiver
  • Frequency: fixed UHF FM, crystal quartz controlled
  • Audio response: 200 Hz – ~4500 Hz
  • Audio signal output: 94 dB
  • Noise filter: soft squelch
  • Sensitivity: SINAD 17 dB @ E=2mV/m
  • Channel selectivity: 49 dB (at 200 kHz channel spacing)
  • Antenna: magnetic, integrated
  • Spurious emissions: below – 51 dBm ERP
  • Distortion: 5% (depends on the volume )
  • Weight: 1.5 g (with battery)
  • Battery autonomy: operational time up to 5 hours
  • Current consumption: 1.8 mA
  • Type of battery: alkaline AG4
  • Working distance: 200 m, in open space
  • The MRF400-B spy micro earpiece UHF FM receiver is being delivered with 1 battery.


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