See how the transmitter is used.
The supplied footage shows battery installation, frequency adjustment, receiver setup and a reception demonstration. Follow the demonstrated procedure rather than treating the tuning button as an on/off switch.
Original close-up photograph showing the transmitter size.
Long-range FM audio transmitter
Spy-IL3 Long-Range FM Spy Bug
Live audio. Up to 700 m in open areas.
A compact microphone transmitter, supplied tuned to 77 MHz. Listen live on a compatible FM receiver, with one-button frequency adjustment when your setup needs it.
$35.00 USD
37 × 12 mm board2 × CR2032 includedMade in Israel
A receiver that covers 77 MHz is required. Many standard US FM radios start at 88 MHz and cannot receive the supplied setting. View compatible FM receiver →
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US shipping · $9.00 per item
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From microphone to receiver
Small transmitter.
A longer connection.
Sound → microphone → FM transmission → receiver
01
Fit the batteries.
Insert the two supplied CR2032 cells as demonstrated. There is no separate power switch.
02
Tune to 77 MHz.
Use a compatible extended-band FM receiver and match the supplied frequency.
03
Listen live.
Position the antennas and adjust receiver volume. Remove both batteries when finished.
Up to 700 m (about 2,297 ft / 0.43 miles) is the published maximum in open areas. The city illustration explains the signal path; it does not promise a 700 m connection through buildings. Obstacles, interference and receiver choice affect reception.
Live sound over FM
Compact hardware.
Listen in real time.
Spy-IL3 combines a sensitive 5 mm electret microphone, frequency-stabilized FM transmission and a built-in holder for two CR2032 batteries. The circuit board measures 37 × 12 mm.
Each unit is checked and supplied tuned to 77 MHz. Frequency adjustment is available within 76–110 MHz, using the small tuning button and the video guide below.
This model transmits audio as it happens. It does not store recordings internally. Choose a receiver that covers your selected frequency and tune both devices to the same value.
Up to 700 mPublished maximum · open area
77 MHzSupplied tuning
76–110 MHzTransmitter tuning range
2 × CR2032Batteries included
Watch the real setup
Power, tuning and reception.
Original supplied demonstration, with sound.
Two details worth knowing
Match the frequency.
Remove the batteries after use.
Tuning is not power switching.
The transmitter supports 76–110 MHz. The recommended receiver covers 63–108 MHz, so keep your setup within their shared 76–108 MHz range.
Battery-powered operation.
Inserting the cells powers the device. Remove both batteries after use to stop transmission and prevent gradual discharge.
At a glance
The details,
clearly laid out.
FM transmission with a separately powered receiver.
Complete your setupExtended-Band
Extended-Band
FM Receiver
FM 63–108 MHz.
Receives the supplied 77 MHz setting.
Sold separately.
- Model
- Spy-IL3 · FM microphone transmitter
- Audio function
- Live transmission; no internal recording
- Published open-area range
- 500–700 m / approx. 1,640–2,297 ft
- Supplied frequency
- 77.0 MHz
- Transmitter tuning range
- 76–110 MHz; adjustable with one button
- Recommended receiver overlap
- 76–108 MHz with the linked 63–108 MHz receiver
- Circuit board
- 37 × 12 mm / approx. 1.46 × 0.47 in
- Microphone
- 5 mm electret microphone
- Specified indoor pickup area
- Up to 100 m² / 1,076 ft²; room and noise dependent
- Power
- Two CR2032 lithium batteries, included
- Published operating time
- Approx. 6–10 hours; depends on batteries and conditions
- Power control
- Insert batteries to power on; remove both to power off
- Antenna
- Approx. 90 cm / 35.4 in; 0.4 mm insulated wire
- Receiver
- Required, sold separately; must cover selected FM frequency
- Manufactured in
- Israel
Your delivery
What’s included.
- One Spy-IL3 FM microphone transmitter
- Attached antenna and built-in battery holder
- Two CR2032 lithium batteries
- Protective storage case
- Tuning instructions and video guide link
FM receiver sold separately. Matchsticks and multiple example units in photographs are shown for scale and context.
Before you choose
A few useful answers.
Can I use a regular American FM radio?
Only if it covers the selected frequency. A radio starting at 88 MHz cannot receive the supplied 77 MHz setting. The linked extended-band receiver covers that setting.
Is the receiver included?
No. This card is for the transmitter and listed accessories. The receiver is a separate product.
Does Spy-IL3 record audio?
No. It sends audio live to a compatible receiver and has no internal recording function.
Is 700 m guaranteed?
No. The published 500–700 m range applies to open areas. Walls, interference, antennas and receiver sensitivity change the result.
How do I switch it off?
Remove both CR2032 batteries and store them separately. This transmitter has no separate on/off switch.
How long do the batteries last?
The current website specifies approximately 6–10 hours. Battery condition and operating conditions affect the actual time.
Can I retune it to 110 MHz with this receiver?
The transmitter reaches 110 MHz, but the linked receiver stops at 108 MHz. Use their shared 76–108 MHz range.
Get the right receiver for your frequency.
Ask Alex about Spy-IL3 tuning or receiver compatibility.