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Sound activated gsm listening device, voice trigger Once there any voice around, it can call the preset phone No. automatically. How to use? 1. Insert a new SIM card 2. Use another phone to call this SIM card No. to start monitor Note: 1. Keep the device have power, you can recharge it by plug or connect it to PC by USB 2. Make sure the SIM card insert into with the right side 3. Put it in the place have strange GSM signal 4. Some models have voice trigger, you need turn the "sound activated" switch on and pre-set your phone No. to it 5. Application: baby, older monitor, anti-steal, home security, detective Specifications:Easy to install, and no configuration (just put phone card in) Work with bands (800MHz, 900MHz, 1800MHz). Please check if it can work with your local system format before purchase Weight: 0.20kg Size:5.2 x 4.0 x 1.5 cm . Compact Design Not suitable for both CDMA and 3G networkKey Features:Super-sensitive audio surveillance Frequency: 900, 1800, 1900 Embed four condense microphone 24 hour non-stop power supply All GSM SIM card compatible Microphone range(Meter): 5 7(Radius), 4 levels Receive sensitivity: -\+10K Working temp: -40 50'C Responding frequency: 1.2K 800Khz Stand-by time: 7 days Working time: 4 hours Notification via telephone or message after voice is detected.How to use:Place the SIM card into the slot with the contact points facing down (according to the pictures indication) The flash of red light indicates the SIM card is correctly inserted. SIM Audio Monitor devicewill completed initialization and maintain in stand-by status Dial the SIM card number, you could hear the sound around the SIM Audio Monitor device Charging up the device, Red and Green LED lights ON. When the device is fully charged up, only Red LED lights ON Please do not use it to engage any illegal activity Notice:The SIM surveillance which you received might not has exact appearance as the photo revealed, but deliver exactly the same functions as listing stated. Do not insert the SIM into the slot in the wrong direction.Package Includes:1 x GSM SIM Audio Surveilance Device, 1 x Charger 1 x USB Cable 1 x User Manual