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The DD3001 from KJB is a wireless detector test device. The DD3001 detects all mobile phone activities including: SMS and MMS messaging, audio phone calling and data transmitting. Ideal for radio frequency (RF) engineers and technicians, it offers wireless signal detection in theaters, restaurants, trains, buses, library, governement facilities, financial institutions and testing centers. Featuring adjustable sensitivity and frequency band and buzzer or vibration alert. Detector shows an instant display of scanned frequencies. Note: Cell Phone GPS Detectors only detect cell phone/GPS signals when transmitting.