This Certified Refurbished product is tested & certified by Samsung to look and work like-new. The product includes all original accessories, and is backed by a 90-day warranty DOLBY DIGITAL: When you add the Samsung HW-KM55C Soundbar with Wireless Subwoofer to your home entertainment system, you won't just hear the difference. You'll feel it. Dolby Digital sound and surround sound expansion deliver added depth, while the Soundbar's wireless Bluetooth connectivity lets you fill the room with your favorite music. SURROUND SOUND: The Surround Sound Expansion feature adds depth and brings a new dimension to deliver more a more realistic and immersive audio experience.