Edifier Prisma 2.1 Bluetooth Audio Speakers System - Silver Bluetooth pairing capability with Bluetooth enabled devices Separate bass adjustment control located on the subwoofer 3.5mm input jack located on the rear of the subwoofer 5 inch downward firing subwoofer, 234 inch mid-range, 19mm PV dome tweeter, all magnetically shielded, w/class D digital amplifier for enhanced bass frequency response Universal Power supply (100-240V)