360&iexcl;&atilde;Mini Music Speaker MicroSD TF Card Slot Vibration Resonance FM MP3 PC Phones Power Supply: This product can be powered through a USB port or will operate using the built in 3.7V 600mAh lithium battery. Sound Source: The vibration speaker can be connected to any 3.5mm stereo jack or it can operate using the built in TF card (Micro SD) card slot. Audio output: 3.5mm audio cable. Input DC voltage: DC 5V. Frequency: 80Hz-18 KHz.