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Description:Instructlon: 1, Insert two pieces of 1.5v aaa size batteries in the battery compartment. The LCD Display will show the time. 2. Press on/off button once enter transmit mode, LCD will show the current transmit Frequency, press or button to increase or decrease adjust frequency. Press on/0ff Button once again to stop transmit andthe real time will show on LCD display. 3. When you want store current frequency, press m1, m2 or m3 button for about 3 seconds For the store location for you to select frequency easily. When you want to Use the store frequency, press m1, m2 or m3 button once. The memory number will Show on display. 4. When the unit show the time, press and hold set button for about 3 seconds enter Setting mode, the last number of minute will flash, press or button to set your Desired digit, press set button to confirm andenter to set the first first digit Of minute, using the same operation to set the digit of minute and hour. The LCD 5. When in the transmit state, press set button will show the time for about 3 seconds. 6. Low batterv detect function 7. Temperature display. Specitications: Frequency response:20hz-20khz power source:2aaa Batteriesseparation:50db or the car's power sourceoperating current:38ma Transmit distance 5m operating volt:1.5~3v Distortion 3%transmission range:(f=75khz. F=1khz)87.5-108mhz(interval 0.1mhz) signal to noise ratio 45dbtemperature:1000