[. . . ] [. . . ] Exceptional. The 4031 WIRELESS 4031 WIRELESS With its perfected unidirectional transducer system, innovative resonators and ergonomic, oval-shaped ear adaptors, the 4031 WIRELESS is loaded with ground-breaking innovations. If that weren’t enough, these in-ear headphones also feature a durable and attractive ceramic housing complete with an elegant design. packaging Dimensions of inner master carton (W x D x H) Number of products per inner master carton 4031 WIRELESS   4044155075625 615104224643 505484 Diffuse field equalized 8–41, 000 Hz (-3 dB) 5–46, 500 Hz (-10 dB) Dynamic, vented closed 16 O 125 dB SPL (1 kHz, 1 Vrms) < 0, 06 % 1 KHz, 94 dB Intraaural 8g 3. 5 mm stereo plug Symmetrical, oxygen-free (OFC) copper cable, 1. 2 m -10 °C to +55 °C -26 dB 4031 WIRELESS in-ear headphones, Ear adaptor sets (5 pairs of different sizes), Carry case, Cleaning tool, Instruction manual Closed rigid box, full cardboard 220 mm x 125 mm x 60 mm 258 g 340 mm x 275 mm x 260 mm 10 548725 04/12 Printed in Germany Sennheiser is a registered trademark of Sennheiser electronic GmbH & Co. [. . . ] [. . . ]