Skullcandy Snoop Dogg Signature Skullcrusher (Blue) (Discontinued by Manufacturer) 30mm neodymium magnet speaker 30mm vibration speaker, Vibration unit: 100hz Frequency response: 20-20K Hz, Impedance: 32ohm Sensitivity: 99db Gold plated: 3.5mm stereo plug and 6.3mm adapter, In-line vibration level adjustment and on/off switch, Cord length 1.5m