The following description for SP-718 only.

output:(RMS)5.5W*2
impedance:3 Ohm
power:DC 12V(8pcs R20S batteries)
spesker unit:2"*2
size:266(L)*189(W)*73(H)mm
weight:1.29KG
hi-fi sound
charge for ipod
am/fm radio
snooze and sleep
battery support
video-out for ipod
usb transmission beteen ipod and pc