Introduction: SK-SJ01 GSM cell phone jammer is the most popular signal jamming security product. This model GSM cell phone jammer can form an electromagnetism protection field around the user, in order to block cell phone from receiving and transmitting the signals to the base station; thus it can avoid the leakage of secret information through your cell phone. At the same time the GSM cell phone jammer can eliminates the noise pollution. This kind of GSM cell phone jammer is really now a favorite from private client, as well as a necessity for law enforcement and private places to interrupt communications by criminals and terrorists, and also for accomplishing a more cultured society. Features of SK-SJ01 GSM Cell Phone Jammer Effective guard GSM signal bandwidth position tracking Effective disturb GSM signal bandwidth, protect your private activities Portable, Small, Compact and Robust. Built-in high capacity Li-ion battery, it can work continuously Using option car-charge to offer the power To keep you away from noise or disturbance of unexpected cell phone calls or text messages (SMS) World wide compatible. To block cell phone communication links within an effective area. No transmissions or receptions of cell phone call in coverage area. All specified frequency bands will be blocked simultaneously. For using at meeting rooms, conference rooms, museums, galleries, theatres, concert halls, churches, temples, restaurants, classrooms, training centers, factories, banks, trains, buses etc. Important Notice: After charging the GSM cell phone jammer you will see a green LED light, however please recharge the Jammer two more times for full battery charging. The jamming area is influenced by the location of the cell tower and the obstacles between cell tower & the GSM cell phone jammer. It means that in normal condition if the distance is close between the cell tower & the GSM cell phone jammer, it will have very less jamming area. Likewise, if there are obstacles & walls between the cell tower & the cell phone, the GSM cell phone jammer will give less jamming area. Specification: Jamming Area 0.5 meters to 15 meters (Depends on signal strength, at the site to be jammed) Cellular Systems Output Frequency GSM 920-960Mhz Battery Capacity Built-in Battery: 4V/1600mA/h Dimension 95mm(W) * 48mm(L) * 22mm(H) Net weight 0.2KG Accessory Charger and Car charger 1 Antenna Working Time 1-2 Hours Power Consumption 2 Watt 95mm(W) * 48mm(L) * 22mm(H)