







Seismic stethoscope bug through wall/floor F01


The modern F01 seismic listening device by Spreest enables reception of vibrations and sounds passing through doors, wooden elements, and other thin partitions in real-time.
The device works best when the probe is directly applied to doors or thinner surfaces, through which vibrations are more easily transmitted.
The effectiveness of listening depends on many factors, including the type of material, thickness of the partition, its construction, ambient noise level, and the strength of the sound on the other side.
Volume control allows adjusting the amplification level to the type of partition and prevailing conditions.
Key features
1. Listening through walls and other partitions – The probe receives vibrations transmitted through doors, thin walls, and other structural elements, allowing listening to sounds from adjacent rooms.
2. High signal amplification – The device offers a maximum sound amplification of up to 13,000×, allowing it to pick up faint vibrations transmitted through structural surfaces.
3. Adjustable volume – The knob allows gradual adjustment of the volume level to listening conditions.
4. Clear LED signaling – A blue LED indicates device operation, red indicates charging, and green indicates a fully charged battery.
5. Real-time listening – With headphones connected, the user can continuously listen to received sounds without delay.
6. Simple operation – The device is ready for use after power-on – it does not require app installation or configuration.
7. Built-in battery – The 100 mAh battery allows the device to operate for up to 7 hours. It ensures mobility and allows using the device without constant connection to a power source.
Device elements
1. Headphone port (3.5 mm Mini Jack)
2. Power switch/Volume control knob
3. Device charging port (USB-C)
4. LEDs:
– Blue: Indicates device operation
– Red: Indicates device charging (turns green when fully charged)
5. Contact probe
Technical specifications
- Probe sensitivity: -60 dB
- Maximum sound amplification: 13,000×
- Example surfaces: Doors, thin partitions, wooden elements, metal, cement and other rigid structural materials
- Current consumption: 12 mA
- Battery type: Lithium-polymer
- Battery voltage: 3.7 V
- Battery capacity: 100 mAh
- Charging time: Up to 90% – 2 hours, full charge – 5 hours
- Operating time: Approximately 7 hours
- Dimensions: 35 × 35 × 35 mm
- Weight: 45 g
The set includes
- 1x F01 seismic listening device
- 1x Headphones
- 1x USB-C cable
- 1x User manual
Before using the device as a listening device, we suggest familiarizing yourself with legal restrictions.




