[. . . ] Reason for return and description of the problem. Make sure that the headset's microphone is facing your mouth and positioned properly. Verify that the unit is not in mute mode. I DON'T HEAR CALLERS. Turn up the volume using the volume control. Make sure the headset's speaker is positioned snugly over your ear. T H E H E A D S E T I S U N C O M F O RTA B L E . Your Plantronics M1000 headset utilizes 2. 4GHz Bluetooth technology to provide lightweight, hands-free, private and completely secure communication -- without the hassle of wires. [. . . ] Observe proper orientation between battery and charger contacts. 5. Charge the battery in accordance with instructions supplied with this unit. 4. Exercise care in handling the battery in order not to "short" the battery contacts with conducting materials such as rings, bracelets, or keys. Released electrolyte is corrosive and may cause damage to eyes or skin and may be toxic if swallowed. 2. Use only the battery supplied with this product. B AT T E RY Never mount or store your headset over any air bag deployment area as serious injury may result when an air bag deploys. Turn off your headset prior to boarding an aircraft. Do not use your headset in an aircraft. Observe all signs that require an electrical device or RF radio product to be switched off in designated areas. These could include hospitals, blasting areas, and potentially explosive atmospheres. CHILDREN. Never allow children to play with the headset -- small parts may be a choking hazard. Batteries can be swallowed by children and are dangerous if swallowed. Always store and dispose of batteries where children can't reach them. If you use the product while driving ensure your attention and focus remains on your responsibility of driving safely. Check local laws regarding use of a mobile phone and headset while driving. SAFETY !CAUTION: To reduce the risk of fire or injury to persons, read and follow these instructions. IMPORTANT SAFETY INSTRUCTIONS Do not stick anything inside the product as this may damage internal components. Do not use liquid cleaners or aerosol cleaners as they may damage the headset or finish of the headset. Use a damp cloth to clean the external portions of the headset. Protect your headset from spills, excessive rain, and wet locations. Never submerge your headset in water or other liquids. CARE CHARGING Charger Output: 5. 5V/250mA maximum, center contact positive Only charge the headset battery in accordance with the instructions of this manual. !CAUTION: Do not disassemble the AC adapter of this product as it may expose you to dangerous voltages or other risks. Incorrect reassembly can cause electric shock when the product is subsequently used. CAUTION: If the headset becomes hot during charging, disconnect the AC adapter from the wall and contact qualified service personnel. !CAUTION: Use only the supplied Class 2 AC adapter to charge the headset from an AC voltage or wall outlet. ! 220-Volt UK AC adapter. Replacement AC adapter/charger for United Kingdom. 220-Volt AC Adapter. Replacement AC adapter/charger for North America AC ADAPTER Replacement headset battery, 2. 4V Nickel Metal Hydride (NiMH) M 1 0 0 0 B AT T E RY 345 Encinal Street, Santa Cruz, CA 95060 (800) 544-4660 · 45837-01 PARTS AND ACCESSORIES Optional car lighter Y-adapter allows you to charge your M1000 headset and one other device from any 12-Volt car lighter socket. CAR LIGHTER ADAPTER Replacement earloop. M1000 FLEXIBLE EARLOOP www. plantronics. com 07. 02 QUICK START AN D IN FORMAT ION GUIDE M1000 BLUETOOTHTM CORDLESS HEADSET FROM PLANTRONICS M1000 B L U E T O O T HTM W I R E L E S S H E A D S E T Welcome to the cutting edge of hands-free and wire-free technology. 2. 1 ­ Open the battery compartment by pulling on the two battery door latches. [. . . ] 5. 4 ­ MUTE FUNCTION · To mute the microphone while on a call, PUSH IN on the MUTE/VOLUME dial. A tone, followed 2 seconds later by a reminder tone, indicates mute function. 4. 2 GETTING THE PERFECT FIT Customize your headset so it fits comfortably. [. . . ]