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Product Packaging:Standard Packaging Sentryâs HO700 wireless headphone with transmitter is great to use both indoors and outdoors for listening to music or TV without disturbing others. Headphone features a built-in FM radio with reception up to 50 feet. Use around home, at the office or outdoors with TV, iPhone, iPod, MP3, CD, DVD players and more. Features on/off button; frequency range: 20Hz-20kHz, impedance: 16 Ohms, sensitivity: 110db; Four foot long cord length with 3.5mm plug. Transmitter uses two AAA batteries (not included); headphone uses two AAA batteries (not included).