Note: please keep your fingers away from the microphone hole, otherwise the sound will be very low. Features: Where there is a voice, where someone is talking, this item will contact you immediately. Professional double microphones design, working independently and cooperating with each other. Support the setting of multiple sets of numbers, and dial back one by one, without any error or omission of emergency feedback High-definition sound quality: imported voice chip, seamless intercom communication Private permission protection: open permission, only binding number can operate, exclude any harassing phone; Multiple modes of replying reminders, SMS and phone calls, short message mode all the time care, intermittent reminder of the host voice situation on site. Suitable for car burglar alarm and household monitor, good security device Specification: Item type: Voice Pick-Up Material: plastic Color: black Voltage: 100-240V Plug :EU plug Power supply: lithium battery (USB charging) Antenna: yes Microphone Quantity: 2 Effective Range: 10m Working mode: SIM GSM Response frequency: 1.2-800khz Standby time: 2-3 days Application Scope : automobile, household, etc Size: 4.4*3.3*1.3cm/1.7*1.3*0.5in Weight: Approx.126g/4.4oz Package list: 1* Voice Pick-Up(SIM card not included) 1* USB Cable 1* Charger Adapter