The red/black Skullcandy Ink'd Wireless are Bluetooth-enabled wireless in-ear headphones designed to deliver full-range sound reproduction, extended listening time, and lifestyle convenience for music lovers and audio aficionados traveling, relaxing, or studying inside or outdoors. Their 10mm drivers utilize neodymium magnets and produce a wide frequency response of 20 Hz to 20 kHz.A built-in battery provides up to eight hours of listening time and is rechargeable via USB connection with the supplied charging cable. The integrated microphone and remote buttons make taking calls and controlling your music easy and convenient. Two pairs of silicone eartips allow you to achieve a secure and comfortable fit, which yields isolation from ambient noise. The lightweight flex collar coils for compact storage in your pocket, bag, or purse.