VIRAL Bluetooth headphones, designed for smartphones and tablets, are compatible with Bluetooth 4.2 (chipset: JR); control via smartphone or buttons on the headphone housing; modes: Bluetooth, AUX, phone calls; very high-quality speakers guarantee crystal-clear sound; 4 buttons — used to answer and end calls, play and pause music and adjust the volume; raised buttons of different shapes make operation easy without taking the headphones off; quick folding/unfolding makes travelling easier; frequency response: 20 Hz-20 kHz; impedance: 32 Ω. sensitivity: 115±3dB /1mW (at 1kHz) power 40mW built-in 150mAh battery (rechargeable via micro USB) speaker diameter: 40 mm micro USB connector (used for charging the battery) equipped with an on/off switch rubberised built-in indicators built-in microphone (phone call function when connected to a phone via Bluetooth) AUX (after the battery runs out, you can listen using the included 3,5 mm mini jack cable) Included: USB(M)->microUSB(M) cable and 3,5 mm mini jack (M)->mini jack 3,5 mm(M) cable Details: