Sennheiser RS 5000, In-Ear Wireless Headphones, Rechargeable wireless headphones, Three different hearing profiles to choose from, Has a transmission range of up to 70 m, Max. SPL (sound pressure level): 125 dB, Frequency response: 15 - 16,000 Hz, Up to 12 hours of operation time, Weight of the earphones: 61 g, Includes silicone tips (2 sizes), base station, power supply and cable, Additional headphones optionally available under Article Nr #491326# (up to 4 headphone sets can be operated with one transmitter)