This is the price inquiry on Taobao in China：4.37yuan
Product Features
Material: Waterproof
Usage: transmitter, receiver
Nominal frequency: 40 ± 0.5KHz
Sensitivity: -75UBARSPL:>108 (10V30cm/normal wave)
Capacitor: 1800+30% @ 1KHZ
Detectable range: 0.3-3.5 meters
Input voltage: limited to 140Vp-p
Storage temperature:<25 ° C+80 ° C
Working temperature: -20 ° C+80 ° C
Shell material: Aluminum
Weight: Approximately 4.0 grams
User reviews
User 1: Intact and undamaged, good.
User 2: Very user-friendly
From the Internet.Publisher：writer，Please indicate the source when turning around：https://www.machinery-agent.com/Electronic_component/1316.html
