RadioShack Lightweight Sport AM/FM Stereo Headset Radio Controls are conveniently located on the earcups. Comes with a built in antenna to enhance signal strength, while the extended bass function enriches deep tones. Has an adjustable double headband keeps headphones securely on your head and foam ear cushions for added comfort. Frequency range: AM 520-1720kHz, FM 88-108MHz. Uses 2x AAA battery for operation (battery not included).