When you first hear the SoundTouch 300 soundbar, you’ll understand why we spent nearly 10 years perfecting the technologies that really make it sing. But you can have more, whenever you want. Just add the Acoustimass 300 wireless bass module. It’s the difference between hearing bass and feeling thunder. 
 
SPECS
Dimensions/weight
SoundTouch 300 soundbar:38.5" W x 2.25" H x 4.25" D (10.4 lbs)
Inputs and outputs
Rear of the soundbar
1 HDMI™ output with Audio Return Channel (ARC)
1 HDMI input
1 optical digital audio connection
1 power input
1 Ethernet port for SoundTouch and software updates via a network
1 3.5 mm jack for ADAPTiQ system setup
1 3.5mm jack to hardwire the bass module
1 micro-USB connection
Additional details
Supported audio formats: Dolby Digital, DTS
Video source compatibility: HDMI and 4K pass-through
What's in the box
SoundTouch 300 soundbar
Universal remote
2 AAA batteries
ADAPTiQ headset
Power cord
HDMI cable
Optical cable