Model Number: EFR-110RS22B1-a Brand Name: HTW Key Specifications/Special Features: Specifications:Nominal frequency: 40 ±1kHz Capacitance: 400 ± 15%PF Ring time: ≤1.2 minutes Sound pressure level: 105 ±5dB Sensitivity: -73 ±5dB Resistance: 500Ω Input voltage: 150V AC Operating temperature range: -35 to 80°C Storage temperature range: -40 to 85°C Weight: 2.4gFeatures:High sensitivity With transmitter and receiver Housing material: aluminumApplications:Range finders Burglar alarms Automatic doors