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Pain Away Portable Low Frequency Tens Unit Stimulator For Lower Blood Pressure, Neck And Shoulder: Product Features and Functions: Power: DC4.5V, 3AAA battery Frequency: 1~330Hz Humidity: ≦80%RH Product weight:90g Safety classification: Model BF internal power 1,LCD Display 2,Has six major functions for Manual mode: Hammering, Acupuncture, Naprapathy, Cupping, Scraping and Massage. Has four functions for the automatic mode: Low Blood Pressure, Body Shaping, Neck/Shoulder,