Power supply: Built-in Lithium Battery; 2 AA batteries(not included); DC 5V</br>Size: 4.92 x 1.18 x 3.03 in (12.5 x 3 x 7.7 cm)</br>Weight: about 6 oz (168 g)</br></br>Product Description</br></br>Features:<br> 1 . FM/AM/SW 3 BAND RADIO WITH MP3 MUSIC PLAYER<br> 2 . BUILT-IN SPEAKER<br> 3 . EXTERNAL POWER CHARGING INTERFACE INPUT DC-5V<br> 4 . BUILT-IN LITHIUM BATTERY<br> 5 . EARPHONE JACK 3.5 MM<br> 6 . WITH USB/TF CARD SLOT<br> 7 . 360 ?? ANTENNA FOR BEST RECEPTION FM OR SW.<br> 8 . DC : 3V(UM3 AA *2PCS) BATTERIES NOT INCLUDED<br> 9 . MP3/FM/AM/SW switch to select "P3" music playback or "FM/AM/SW" listen to the radio function switch.<br><br> Frequency range:<br> FM : 88-108MHz ; <br> AM : 530-1600KHz ; <br> SW : 8.0-18MHz<br><br> POWER OUTPUT : ?? 300mw<br><br> DC IN : 5V<br><br></br><br/>http://www.amazon.com/gp/product/B01E3EE0Q88