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Long range in-ear receiver
ID: MRF400-C
Price: EUR 290

UHF/VHF in-ear receiver/ prompter

Spy micro earpiece RF in-ear receiver, for discreet communications.


Key benefits:

  • MRF400-C enters completely in the ear canal, without anyone to see it.
  • The working distance is 1000 meters in open field.
  • The spy micro earpiece, MRF400-C in-ear receiver, has a black rubber body, for a better invisibility in the ear canal, imitating the darkness in the ear.
  • No accessory on your body! No neckloop needed!
  • 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
  • Secrete communication! your conversation will not be taped by phone operators and no leads to your location

For a two-way (duplex) covert communication, you will need:


Technical specification for MRF400-C spy in-ear RF Receiver:

Dimensions: 13 x 6 x 6 mm
Receiver mod: narrow-band RF receiver
Frequency: fixed UHF FM, crystal quartz controlled 432-468 MHz
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 48 hours
Current consumption: 1.8 mA
Type of battery: zinc air A10
Working distance: 1000 m, in open space

The MRF400-C spy micro earpiece UHF FM receiver is being delivered with one A10 battery.

Image gallery:

in-ear prompter  UHF in-ear receiver