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Bands Frequency: GSM 900 MHz, 1800 MHz, GSM 1900 MHz. SIM card audio bugging device with high-sensitivity microphone that can monitor the surrounding sounds at the same time. Prominent sound quality makes spying more reliable. Power supply: 24 hours non-stop, battery work time is about 2 to 3 hours, with long standby time up to 170 hours. Features 1.Work frequency:850Mhz/900Mhz/1800Mhz/1900Mhz 2.GSM voice/Audio monitor Bug. not suitable for either CDMA/3G network,Compatible with All GSM SIM card . 3.Prominent sound quality makes spying more reliable 4.Voice activation.you can call back your phone automatically when the sound arround it up to 45DB 5.You can send message command or cancel voice activation function by easy SMS "1111 or "0000""only 6.Ultra tiny dimension 7.Power Supply:24 hours Non-stop 8.Microphone Range (Meter):5~7(Radius).4 levels 9. Working Temp:-40~50'C 10.Responding Frequency: 1.2K~800Khz 11.Standby time:2-3 days(If Acoustic Alarm function Off.standby time:10-12 days) 12.Working Time:5 hours Package Includes 1xWireless GSM SIM Micro Spy Ear Bug 1xUSB Charging Cable 1 x Use Manual (not with GSM Sim Card,you need buy from local cell network supplier) you can download app from this link https://fangzoudiu.xcloudtech.com/HW/