PRODUCT GRADING Refurbished Pristine > Minor if any signs of use and wear > Refurbished to the highest standards. Refurbished Excellent > Very light scratches and light signs of use > Refurbished to the highest standards. Refurbished Good > Visible scratches and signs of use throughout > Refurbished to the highest standards.Item may arrive in non-original retail packaging WHAT IS IN THE BOX Sony Wireless On-Ear Home Headphones, 100m Range, Black (MDR-RF811RK) PRODUCT DESCRIPTION Roam freely with a pair of Sony MDR-RF811RK Wireless Headphones in black, delivering high-fidelity sound in a flexible package. Perfect wireless headphones for home listening Using an RF signal, these Sony MDR-RF811RK Headphones are great for enjoying TV and music at home more flexibly. They offer a 100 m wireless range so you can sit in the most comfortable position in any part of the room. If you need to get up or move around the room for any reason, there's no reason to stop listening. You'll love the additional mobility and freedom they give you, allowing you to enjoy your entertainment to the full. Full-range audio The Sony RF811RK Wireless Headphones offer a 20 – 20,000 Hz frequency range that allows them to clearly and faithfully reproduce those deep lows and precision highs for complete audio satisfaction. A hybrid driver system gives the headset real dynamics and power, with a 40 mm neodymium element in each earpiece for consistent sonic balance and excellence. Total comfort and long battery life You'll be able to fully adjust the headband to suit your head, assuring long-lasting comfort for those marathon music and movie sessions. A 13-hour battery life allows you to listen for longer, and you can charge the headphones overnight to enjoy the benefits of a full charge. PRODUCT INFORMATION Type - Over-ear Colour - Black Jack - 3.5 mm jack Bluetooth - No Wireless - Yes - RF wireless Bluetooth / wireless range - 100 metres Earpad / ear tip material - Cloth material Acoustic system - Closed Single-sided cable - No Detachable cable - No Passive noise-isolating - No Active noise-cancelling - No Microphone - No Volume control - Yes Playback / functions control - No Control compatibility - All smartphones Control positioning - On-ear Driver type - Neodymium driver Speaker diameter - 40 mm Frequency response - 20 - 20,000 Hz Battery life Up to 13 hours Charging time - 16 hours