Marshall Stanmore Bluetooth Speaker, Cream (04091629) Portable Bluetooth player with 80W output RCA 3.5mm input and maximum sound pressure level is 100 dB @ 1 m Double-ended cable and cabinet principle is bass-reflex Classic Marshall design details. Wireless connectivity : Bluetooth v4.0 aptX Power amplifiers-one 50 Watt Class D amplifier for the woofer,two 15 Watt Class D amplifiers for the tweeters