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The YT-JM311 was designed to set up a block hood to silence cellular phones within a certain radius when the button is pressed. The YT-JM311 could be well used in cell phone unwelcome environment like government buildings, military blishments, conference rooms, school class rooms, churches, etc. Under the working condition, the YT-JM311 blocks receiving function of cell phones.The YT-JM311 is specially developed for those people who need protection to his/her privacy or security. This device enables you to establish a GSM or CDMA free environment and maintaining a peace of mind.Features:Low power consumptionEasy operation/Easy maintainThe power and coverage area could be adjustedCompact size and light weightNot hazardous to health and do not damage cell phone's regular functionsBuilt-in 800mA rechargeable Lithium ion battery allowing continuous operation for 1.5 hours without re-charging.Suitable for: Public place(Library, Movie Theater, Concert hall, Museum.. ), Security enhancements(