[. . . ] N/D167 Vocal Microphone General Product Description The N/D167's acoustic response presents optimal performance in a live sound environment. [. . . ] Always point the microphone at the desired source of sound, and away from any unwanted sources. 2. The microphone should be located close to the sound source to minimize interference from other potential sound sources. Place each microphone three times farther from other microphones as from the desired sound source. Minimize over-handling of the microphone to reduce unwanted mechanical noise. 5. Working close to the microphone will increase the bass tone and also provide increased gain-before-feedback. Warranty This product is guaranteed against malfunction from any cause for two (2) years from the date of original purchase. In addition, the Limited Warranty for the acoustic system contained in the microphone shall apply for the life of this product, defines as a period of ten (10) years from the date that the manufacture of this microphone model has been discontinued. [. . . ] For customer orders, contact the Customer Service department at 800/392-3497 Fax: 800/955-6831 For warranty repair or service information, contact the Service Repair department at 800/685-2606 For technical assistance, contact Technical Support at 800/392-3497 Please refer to the Engineering Data Sheet for warranty information. [. . . ]