Panasonic RB-Hf420Bgea headphones are for sale. Headphone type: Over-Ear, wireless, Bluetooth. Built-in microphone. Neodymium magnets and 30 mm speakers provide a frequency range of 20-20,000 Hz. The battery lasts up to 50 hours, charging takes 4 hours. Weight 155 g, blue color. Waterproof standard Ipx4.