B&W Zeppelin Air. System type: single speaker, Recommended usage: mobile phone, Speaker placement: Portable. RMS rated power: 150 W, Frequency range: 36 - 42000 Hz. Amplifier output power: 150 W, Amplifier/receiver input interface type: Terminals, Amplifier/receiver output interface type: RCA. Connectivity technology: Wired, Speaker interface type: USB, Wireless technology: Wi-Fi. Housing material: Stainless steel