Rated Voltage : 12V Operaing Voltage: 1 - 30V Max.Rated Current: ?2mA The minimum voice presses: ? 80dB/10cm Resonant Frequency:4000 - Update: 2009-06-10

type:HYD-4216 Rated Voltage (V) : 12V Operaing Voltage (V) : 3?24 Sound Output at 10cm (dB) ? 95 Current Consumption (mA) ?12 Resonant Frequency (Hz): 2700 - Update: 2009-06-09

type: HYT-3015C Rated Voltage: 220V AC Operaing Voltage:200-250 V AC Max.Rated Current:?5mA at 220V AC The minimum voice presses:? 80dB at 220V AC /30cm Resonant frequency: 700 - Update: 2009-06-09

HYD-1407B Rated Voltage (V) 12 Operaing Voltage (V) 1.5?16 Soung Output at 10cm (dB) ?85 Current Consumption (mA) ?8 Resonant Frequency (Hz) 4500 - Update: 2009-06-09

type: HYT-3015A Rated Voltage: 6 V DC 12V DC 24 V DC Operaing Voltage:4 - 8VDC 8 - 15VDC 3 - 28VDC Max.Rated Current: 20mA 15mA 20mA The minimum voice presses: 85dB 88dB 90dB Resonant frequency: 3400 - Update: 2009-06-09