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4G GSM Listening device

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  • OTP-SP42A World first 4G GSM listening device, voice activated voice call back alarm device.

    4G GSM Listening device

     1. Surround voice listening (automatically answer the call after dialing in)

    2. Voice-activated alarm (the module will automatically send SMS notification and call back if the volume exceeds the set volume)

    3. Remote SMS control

    4. GPS location via text message return

    5. Notification function of external alarm device (NC, high-level triggered SMS notification)

    6. Special vocal filter function

    7. Built-in dual MEMS microphone, can be connected with external min MEMS microphone

    8. Support Micro USB power supply, external power supply support DC5-15V 

    9. Support 3.7V lithium battery


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