ROCKDOC PITBULL BT 2WAY PORTABLE - GREEN Features two way Speaker - Listen to music from your music library, laptop, phone . . . anywhere your music is stored electronically. Bluetooth Wireless Capability - Wireless connection to any portable Bluetooth device Output: : 6W (3=3W) THD=10% - Loud Speakers: 1.77 in magnetic resistant 4 Ohms 4GB internal Memory Micro SD memory expansion slot takes up to 64GB card - Stores up to 16,000 songs Dimensions: 2.95" x 1.97" x 2.08"