Kenwood AS-60BT-V. Driver diameter: 4.5 cm. RMS rated power: 5 W. Connectivity technology: Wireless, Frequency range: 2402 - 2480 GHz, Bluetooth profiles: A2DP, AVCTP, AVDTP, AVRCP, HFP, SPP. Product type: Mono portable speaker, Product colour: Red, Volume control: Buttons. Recommended usage: Universal, Audio formats supported: MP3, Compatible memory cards: MicroSD (TransFlash)