GSM Stealth II Cell Phone Detector with White Noise
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Here is a cell phone detector that can find eavesdropping devices and also relies on audio interference to keep you safe. The GSM Stealth II has 3 LEDs and an alarm that lets you know when a telephone starts exchanging data. It has different visual and sound cues for different communication protocols. The NG2000 detects GSM 900/1800, CDMA850 WCDMA2100 (3G, UMTS). The battery life lasts up to 5 days. Sets you back under $300.
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