Headphones: PU plastic, silicone earbuds; In-ear headphones with microphone - designed for use with smartphones such as iPhones, as well as on computers and tablets with microphone and sound capabilities; Speak directly into microphone panel for optimal quality; Headphones made of PU Plastic cord with Silicone earbuds and are approx 3.1l; Includes 3 different sized interchangeable buds for the most comfortable fit for your ear [Earbud sizes: 039 (09cm), 043 (11cm), 047 (12cm)]; Buds come packed in compact square ABS plastic case; Cord wraps around the case to keep from tangling when not in use; Power supply / Technology: Frequency Range: 20Hz-20,000 Hz; Sensitivity: 108±3dB SPL at 1KHz; Input 50mW; Impedance: 32ohms; Driver Unit: 10mm; Plug Type: 35mm Stereo; California Prop 65 WARNING; Product Size: 2.75 w x 2.75 h x 0.75 d