The R2000DB from Edifier are powered bookshelf speakers with a built-in amplifier driving 5-inch woofers and 25mm silk dome tweeters. These speakers have four different inputs including both digital and analog connections. RCA is perfect for audio devices that use RCA and AUX connection such as a turntable or a computer. The optical input is also useful for connecting to computers and TVs and gaming consoles. Bluetooth v4.0 allows for wireless connectivity between the speakers and phones, tablets, laptops, and other devices. The R2000DB comes with a small black remote to switch input sources, adjust volume and select your equalizer modes between classic and dynamic at your figure tips.