WeSC Piston headphones. Music sharing function via 3.5mm port for additional headphones. Hands-free with microphone and remote controls. Compatible for use any device with a 3.5mm jack such as iPhone, Samsung, HTC, Blackberry and many more. Compact folding design for easy carying and storage. Type: 40mm power drivers. 1kHz sensitivity: 120 dB. Impedance: 32 Ohms. Frequency range: 20-20000 Hz. Plug: gold-plated 3.5mm stereo. Fabric cord: 1.10m. Foldable design, Imported.