Sony's ICF-S10MK2 Pocket AM/FM Radio will fit easily into your shirt or jacket pocket for convenience and easy portability. The AM/FM tuner lets you choose from the wide range of radio talk shows and music programming. The built-in Speaker enables convenient listening anywhere, and the earphone jack permits private listening enjoyment and improved sound clarity in noisy environments. Additional features include an LED tuning indicator, a telescopic antenna, and a carry strap.Battery Life (Approx) : up to 45 hours (AM: 45 hours, FM: 40 hours), Battery Type : "AA" x 2 Batteries, Output Power : 100mW (at 10% harmonic distortion) and Power Requirements : DC 3V.