Model Number: EFR-40RS18B1......-1 Brand Name: HTW Key Specifications/Special Features: Sensor applications:Distance measurements Obstacle detection and avoidance Car parking systems Fields refer to ultrasonic transmitting and receiving equipmentsCharacteristics:High-sensitivity, high-reliability and high-stability High and low temperature resistance, humidity resistance, shock resistance, vibration resistance and moreSpecifications:Nominal frequency: 40 ±1kHz Capacity: 2,000pF, ±15% Ring time: ≤1.2 minutes Sound pressure level: >102dB Sensitivity: -70 ±5dB Resistance: 500Ω Directive: 110 x 60° Input voltage: 150Vp-p (maximum) Operating temperature range: -30 to 80°C Storage temperature: -40 to 85°C Weight: 4.3g