BLOW BT470. Audio output channels: 2.0 channels. Connectivity technology: Wired, Bluetooth range: 10 m. Product type: Stereo portable speaker, Product colour: Black. Recommended usage: MP3 player, Compatible memory cards: SD, FM band range: 87.5 - 108 MHz. Battery type: Built-in battery, Power source type: Battery, Battery capacity: 1200 mAh