Internet phone, handset with speaker and microphone Size: 105 x 51 x 15.8mm Interface: 3.5mm jack plug With two AAA alkaline batteries (for amplifying the speaker) With normal cable, 150cm With neutral blister box Compatible with all PC and Mac No driver needed, simply plug and talk! Hhandset design Handsfree, talk and work at the same time Most convenient at work No annoying wearing tranditional headset or earphone With microphone and speakers Frequency: 20 to 16KHz Senstivity: Convenient for listening the music No other speakers needed Support Skype, MSN Messenger, Yahoo Messenger, ICQ and QQ Clearly hear the ring of incoming calls, never miss any incoming calls even not at desk