[. . . ] WIRELESS MICROPHONE SYSTEM INSTRUCTION MANUAL ON ON OFF OFF INSTRUTION: 1. [. . . ] the microphone suit for school speech, meeting speech, teachers and performer on the stage. If you want to have a different frequency, set the receiver and transmitter power sw to off before you do. SPECIFICATION TRANSMITTER PERFORMANCE SPECIFICATION: DATE: 30, 07, 2002 NO. 1 2 3 4 5 6 7 8 9 ELECTRIC PARAMETER Carrier Frequency Range RF Power Output Spurious Emission Tatol Harmonic Distortion Power Source Current Tone Osc. Frequency Dimensions Weight SPECIFICATION UHF 790-865 Mhz 10mW (TYPE) 45dBc 1% DC 9V 30mA 32. 768KHz 290mm/11. 4" 350g(0. 77 lb) TESTER: J. H. LIN SWITCH COVER GRILLE HOLDER SWITCH TUBE ANTENNA POWER LED LIGHT BATTERY INGORMATION: NOTE: Make sure the power switch is in the "OFF" position when changing or installing new battery. [. . . ] Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the use's authority to operate the equipment. POWER LED LIGHT OFF ON 1 C H OFF ON 2 [. . . ]