Detailed Product Description Cell phone jammer/ mobile phone blockers The KYP0031 is small in size: about 5.2cm × 6cm ×1.3cm , it convenient to install and prevent from being seen or discovered by driver to easy. The aim is to stop cell phone connection when driving, it is revent the automobile accidents because of calling they mobile phone when driving Technical specifications: 1. Effective shielding range: 2 meters radius 2. Isolation bandwidth: CDMA: 869-894MHz GSM: 925-960 MHZ DCS:1805-1880MHZ WCDMA:2110-2170MHZ PHS:1900-1925MHZ PCS:1930-1990MHZ 3. Power adapter: 12V