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This is a cell phone signal Jammer engineered to protect your business / family privacy and safety. It is a high-tech product; It can block any GSM/CDMA/DCS/PHS/GPS cell phone signal at a distance of 1~5m (radius) within which cell phone cannot be called in or called out. And it will not interfere with other devices within the range. Features: 1. Creates enough interference to block all cell phone signals around you (GSM / CDMA 849MHz~960MHz / DCS/PHS 1805MHz~1990MHz / GPS 1570-1580 MHz ) 2. Fully metal construction - creates a solid and techie feel 3. Creates a 1~ 5m radius of cell phone signal block out area 4. Built-in 1000m. Ah Li-battery 5. Low power consumption and will do no harm to human body and environment-friendly 6. Lightweight, Easy to carry Specification: 1. Output port: CDMA/GSM; Output frequency: 849~960MHZ 2. Output port: DCS/PHS; Output frequency: 1805~1990MHZ 3. Output port: GPS; Output frequency:1570~1580MHZ 4. Size: 95x 45x 18mm, Weight: 380g