[. . . ] In many countries 85 dB(A) is the maximum legally permissible level for continuous noise exposure during the working day. Exposure to sounds of higher volume levels or for longer durations can permanently damage your hearing!Only replace those parts of the headset whose replacement is described in this manual. [. . . ] You can switch ActiveGardTM off by gently sliding the switch to the upper position using a pointed tool. 7 Operating control for HMDC 26 in conjunction with cable -B-6 Operating control ³ NoiseGardTM ON/OFF switch · LED Switching NoiseGardTM on/off The NoiseGardTM ON/OFF switch ³ allows you to switch the NoiseGardTM active noise compensation on or off. With NoiseGardTM switched off, the headset can be used as a conventional headset. Set the NoiseGardTM ON/OFF switch ³ to the desired position: ON: NoiseGardTM is switched on. The LED · lights up, indicating the battery charge status (see page 9). The LED · is off. 8 Powering NoiseGardTM via two (rechargeable) batteries Insert two 1. 5 V AA alkaline batteries (IEC LR 6) or two 1. 2 V AA rechargeable batteries (IEC LR 6). Observe correct polarity when inserting the batteries. The operating time with batteries/rechargeable batteries is approx. With NoiseGardTM switched on (see page 8), the LED · provides information on the remaining battery/ rechargeable battery capacity. Replace the batteries. 9 Care and maintenance Cleaning the headset Use a soft, slightly damp cloth to clean the headset from time to time. If the headset is very dirty, use a cloth dampened with mild, soapy water. Water entering the housing of the headset can cause a short-circuit and damage the electronics. Replacing the earpads For reasons of hygiene, the earpads should be replaced from time to time. Attach the new earpad to the earcup by pressing firmly around the earpad until you hear all 12 latches lock into place. Repeat for the other earcup. 10 Accessories and spare parts By changing the cable, you can simply retrofit your headset (see "Product variants" on page 13). Cable -6 Cable -7 Cable -B-6 (HMDC) Cable -H-6 Cable -X4F Cable -X5 Cable -X3K1 Cable -X3K1-P48 (HME) Cable -H-X4F Cable -H-X5 Cable -H-X3K1 Headband padding, 1 pair Earpads, leatherette, 1 pair Earpads, leatherette, 100 pairs Earpads, velour, 1 pair Hygiene pads HZH 26, 200 pairs Carry bag Wind screen for MD 424, 1 item Wind screen for MD 424, any quantity Wind screen for MKE 4-2, 1 item Wind screen for MKE 4-2, any quantity Cat. [. . . ] 4. 7 k 5­15 V DC operation: ­15 °C to 55 °C storage: ­55 °C to 70 °C approx. 130 g Manufacturer Declarations Warranty Sennheiser electronic GmbH & Co. For the current warranty conditions, please visit our web site at www. sennheiser. com or contact your Sennheiser partner. CE Declaration of Conformity This equipment is in compliance with the essential requirements and other relevant provisions of Directive 2004/108/EU. [. . . ]