* This portable cell phone jammer is with complete spectrum interference and wide range of up to 10m distance. * This jammer product can blocking all signal of GSM,CDMA,DCS,PHS,3G systems in 5-20m range. * Isolation signal frequency: -CDMA:850-894MHZ -GSM:925-960MHZ -DCS:1805-1880MHZ -CDMA1990:1900-1980MHZ -3G:2110-2170MHZ * Typical coverage: 5-20m * Typical battery: Rechargable Li-battery for 2-3 hours * Dimension:100*42*24mm * color:black * Approved: CE / FCC * After sales service: 1 year warranty