Structure: Waterproof Using method: Dual use Size: D18*12mm Frequency:40KHz+/-1 S.P.L: min.100dB Sensitivity:-70V/uBar Capacitance: 2200+/-20%pF Detectable Range: 0.2-4m Housing material: Aluminum Color: Oxidized Black[...]

Rated Voltage:3Vdc Operating Voltage:2--4V Current consumption: max.80mA SPL: min 85dB Resonant Frequency:2730Hz Operating Temp. -40---+85deg c Weight: 0.6g[...]

Size: 33.5*16*15mm Rated Voltage: 3Vdc Operating Voltage:2--4V SPL: min.80dB Rated Current: max.30mA Frequency:300--500Hz Response time:max.200ms Tone: single Opeating Temp.: -20--70deg c Weight:10g[...]