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Mini GPS GSM SMS Tracker Voice Activated GSM Listening Device With Call Back , More types can be supplied .
Features: Frequency: 900MHz, 1800MHz, 1900MHz Dimensions : 50mm x 40mm x 15mm SIM Card slots - work with all GSM sim card Embed condense microphone. Microphone range: about 20 Meters (diameter)
Call Back Gsm Listening Device : Features: Frequency: 900MHz, 1800MHz, 1900MHz Dimensions : 50mm x 40mm x 15mm SIM Card slots - work with all GSM sim card Embed condense microphone.
The SPECTRA G-50 / G-50 PRO is probably the BEST parabolic microphone in the world. This is the ONLY parabolic microphone on the market with a special unbalanced STEREO audio feeding, delivering ...