1. SCOPE
     This specification covers our product of micro speaker unit for mobile telephone or handset devices used.
 2. MECHANICAL LAYOUT & DIMENSIONS:
     Shown in page 3/6
 3. GENERAL REQUIREMENTS:
     3.1 Operating temperature range: -20℃~+55℃
     3.2 Standard test conditions:
          Temperature: 17℃~25℃  
          Relative Humidity: 48%~80~ (RH)
 4. ELECCTROACOUSTIC CHARACTERISTICS
     4.1.1 Test set up: Measuring conditions and procedures shown in fig (2)
     4.1.2 Impedance: 8+/-15%Ω (@1KHz) without baffler.
     4.1.3 DC resistance: 7.4+/-10%Ω
     4.1.4 Sound pressure level
             96+/-3dB SPL @0.8.1.0.1.5 and 2.0KHz in average (OdB SPL=20uPa)
             Measuring condition: 0.5W (Sine wave) 10cm measured with baffler shown in Fig. 1.
     4.1.5 FREQUENCY RESPONSE CURVE: AS shown in fig (3)
     4.1.6 RESPONSE FREQUENCY: 1100+/-15%Hz 22.0V. (Without Baffler)
     4.1.7 INPUT POWER (NOM/MAX):
             0.5W/0.8W must be normal at a white noise (1W, Fo-20KHz) for one minute.
     4.1.8 AUDIBLE NOISE:
             Must be free audible noise ( Buzzes and rattles) (300 ~8KHz frequency range, input le vel up to 2.53 Vrms)
     4.1.9 DISTORTION: Less than 10% @1KHz.0.1M.0.8W
            Frequency range, input level up to 2.53Vrms
5. RELIABILITY TESTS:
    The sound pressure as specified shall neither deviate more than +/-3dB form the initial value, nor any significant damage after
    any of following testing.
    5.1 HIGH TEMPERATURE TEST:
          High temperature: +70+/-2℃
          Duration: 96 hours
    5.2 LOW TEMPERATURE TEST
          Low temperature: +40+/-2℃
          Duration: 96 Hours
    5.3  HEAT SHOCK TEST
          High temperature: +70+/-2℃
          Low temperature: +40+/-2℃
          Changeover time: 30 seconds 
          Duration: 1 hour
          Cycle: 100

    5.4 HUMIDITY TEST
          Temperature: +40+/-2℃
          Relative Humidity: 90%~95%
          Duration: 96 hours
    5.5 TEMPERATURE CYCLE TEST:
         Temperature: -40℃~+70℃
         Duration: 45 minutes ~ 45 minutes