4G Audio Listening Device with Extended Microphone

Product Code: 4GAL-1

4G Audio SIM-Based Listening and Recording Device

This compact 4G audio monitoring device uses a SIM card to transmit live audio over mobile data or voice calls. It supports live remote listening, sound-activated recording, and automatic file uploads to a secure server. Users can receive push notifications via the companion Audio Monitor app (Android/iOS) once uploads are complete.

Key Features

Live remote listening: Access real-time audio via VoLTE call
Sound-activated recording: Automatically starts recording when sound is detected
Audio upload: Recorded files are uploaded directly to the server
Push notifications: Alerts sent when recording/uploading completes
Continuous recording: Up to 20 hours of recording and uploading on a full charge
Voice-trigger standby: Up to 7 days in standby mode awaiting sound activation
External microphone: 1 m MEMS mic included (extendable up to 6 m via micro-USB cable)
Voice pickup range: Up to 8 meters (26 ft)

Audio and Compression

Sampling rate: 16 kSps, 32-bit per sample
Compression: OGG format at 16 kbps (efficient bandwidth and storage use)
Internal memory: 8 MB (≈ 1 hour of audio)
Server history: Retains 2 days of recordings

Power and Battery

Battery capacity: 1200 mAh / 3.7 V Li-ion
Operating time: Up to 20 hours continuous recording/uploading
Standby (voice-trigger): Up to 7 days
Full charge time: ≈ 2 hours

Connectivity and Network

Network bands:

4G (Bands 1, 3, 5, 7, 8, 20 – Europe)
2G (900 / 1800 MHz)

VoLTE support: Yes
USB mass storage: Supported for data transfer

Software and Compatibility

Mobile app: Audio Monitor (Android / iOS)
Desktop software: Audio Widget (Windows / macOS)

Physical & Environmental

Board Dimensions: 3.5 × 3.5 × 0.5 cm
Operating temperature: 0 – 45 °C (32 – 113 °F)