Astrum RAGA BT HS240 Bluetooth CSR 4.0 Wireless Stereo Headphones Headset Earphones w Built-in Mic for Apple iPhone, iPad, Samsung, Nexus, LG, Sony, HTC - Compatible with Most Smartphones - (Black) Bluetooth Connectivity - In-built Bluetooth V4.0 + CSR headset compatible with all mobile / bluetooth devices Earcups & Headrest - Soft adjustable rubber headrest, padded soft square shaped ear cushions for comfort Wireless Range - Uninterrupted wireless connection range upto 10 meters on class 11 Sound Delivery - Optimal sound delivery, bass headphone with white magnate for powerful bass Microphone - Optimal frequency, Inbuilt hidden mic for skype / mobile call, video call and online voice chat