Video of BTH5: Authorized Rockville Dealer! Features: Rockville BTH5 Wireless or Wired Bluetooth Headphones, Foldable+Detachable Cable Bluetooth Headphones With Incredible Bass and Clear Highs Headphones work wireless or wired! If the battery is not charged you can still use the headphones wired! Bluetooth Version 4.1 connects quickly with a 33 foot range 25-hours music playback at medium volume and up to 40 hours at lower volume Charge time: 2 hours 40mm drivers x 2 Large over-the-ear cups with the thickest and most comfortable cushion in the industry Built-in microphone for hands free calling Ear cup buttons offer easy controls for music and calls Positive Sound Cancellation Incredible deep bass response with extended frequency range Crystal clear highs Minimal sound bleed Soft and comfortable headband Ear cups fold for compact storage Detachable 44” coiled cable Cable is made of 100% Oxygen Free Copper Gold-plated connector USB charging cable included Specifications: Bluetooth Range: 33ft Style: Closed-Back Design: Circumaural Transducer Type: Dynamic Driver: 40MM Sensitivity: 110±3dB Impedance: 32ohm Frequency Response:20Hz – 20KHz Net Weight:400g Owner’s Manual About Rockville Quality Control Procedures: The Rockville brand stands for Quality, Innovation and Value. All Rockville products go through the most rigorous quality control standards in the industry. Products go through months of extensive testing before they reach your hands. All user functions are tested and all internal components are tested for quality. Rockville makes products that are virtually un-breakable! Rockville is one of the only brands in its class to test every concept model for weeks or months before starting production. Once production begins, Rockville sends product engineers to their factory to quality control every line of production. During production every product is tested and on top of that Rockville goes the extra mile and has their high level product engineers do an additional quality control. They test a certain percentage of all products from the production line a second time to ensure that the quality meets their vigorous standards, and to make sure that there is never a batch of products with even a slight problem. All Rockville products are backed with a hassle free warranty, though it is unlikely that you will need to use it.