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In factories, workshop area more cases, or due to the venue limitation, do not facilitate selection point, can consider to use words of installation of high-power blockers, such as SMa – 818K60 type high-power blockers, SMa – 818K200 type high-power blockers, etc. For gas station places 2.5 Aimed at gas stations, such as oil, oil field, LPG station inflammable plasces, choose SMa type 818P explosion-proof signal – cell phone jammer phone use blockers can prevent caused by edm cell phone jammer or corresponding explosion-proof switch, and the harm to avoid or reduce the safety of life and property damage. 2.5.1 explosion-proof type blockers to match the antennas Gas stations are commonly inside the station, if not consider appear around the influence of base station of distance, usually at a gas station just need 1-2 sets can complete the key areas of gas station, cell phone signal shielding is more convenient installation position of selected. Usually 818P explosion-proof type as SMa – used in cell phone jammer phone signal shielding 11B (11C) level and lower, introducing T6 group of explosive gas mixture (district 1 and 2 area) places. 2.5.2 explosion-proof type blockers matchs directional antenna If need to do the key area in gas station, at the same time decrease as far as possible to shield the influence of gas station, can also around 818P explosion-proof type for SMa – cell phone jammer phone signal blockers outfit to antenna, directional antenna set the installation position of right in commonly gas station was easier to find within. Replacing directional antenna can generally be used in the need to retain the station office area for gas station, or signal in surrounding close or don’t need other units by shielding places.