NPC piezoelectric element Detection method: Sound type Operating temperature range (℃): -5 to +55 Power supply (V): 2 x alkaline AA batteries Main body size (mm): 60 x 84 x 207 Amplification degree (db): 55 Frequency band (Hz): 100 to 2000 Notch filter (Hz):150,180 存储温度(℃):-20至+80 电流消费(MA):22(无信号) 连续使用时间(小时):24