Selection and distinguishing of based products of prison cell phone jammer

Selection and distinguishing of based products of prison cell phone jammer shielding system
Product features which might be applicable: large volume, firm structure and big heat dissipation area and weight of more than 6kg; cell phone jammer doesn’t have the external power supply adapter but adopts the 220V power supply to directly connect with the interior of the case; the power supply has the over-voltage protection, under voltage protection and overload short circuit protection; the technical index of the equipment output can not be adjusted and changed. The standard N end should be adopted for the output of shielding signal; the antenna and equipment should be connected with the 50Ω cable and used separately; the equipment takes the module and industry of such all performance indices as CDMA、GSM、DCS、PHS、3G（CDMA2000/TD-SCDMA/WCDMA as the core.
Product feature which should be definitely avoided: small volume and light weight (normally less than 6kg); cell phone jammer can not be directly connected with the 220v power supply and the additional power supply adaptor should be attached; there exists the adjustment device on the cell phone jammer which can freely change the shielding power and distance, such as the power switch, power and distance adjustment and so on; the diameter of output port of cell phone jammer is less than 15mm and only several tiny plastic antennae can be connected and it is hard to connect with the specific antenna.