12 0 khz frequency digitrak transmitter

{"cid":"91220861","title":"SE DigiTrak Transmitter 12.0 KHz Frequency 50Ft Depth Range","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/35\/6f\/d7a6b7383db0fbdeca1be064ca05-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"Rongchang Machinery","Minimum Order Quantity":"1 pc","Delivery Time":"15 - 30 Days","Place of Origin":"China","Packaging Details":"standard packing, as customer demands","Payment Terms":"L\/C,T\/T,etc."}}

{"cid":"91198955","title":"Plastic Aluminum 40khz Ultrasonic Transmitter Sensor 16mm ISO","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/f2\/a0\/800cc94eb2179479850eb6ab8a0a-200x200-1.jpg","attrs":{"Price":"negotiable","Brand Name":"TAIMI","Model Number":"TM-1625H12AT\/R 25KHZ transmitter sensor","Minimum Order Quantity":"1000PCS","Delivery Time":"10~20days","Certification":"ISO,RoHS CE","Place of Origin":"CHINA","Payment Terms":"T\/T","Supply Ability":"100000\/month","Packaging Details":"safe packaging","Type":"Transmitter\/receiver","Application Humidification":"16m long distance measurement sensor","Output":"Digital Sensor","Frequency":"25KHZ\/40khz ultrasonic plastic aluminum sensor","Usage":"tranmitter sensor","Color":"black\/aluminum","Warranty":"3 years","Measurement":"0.2~18m","Theory":"Ultrasonic Sensor","Material":"plastic\/aluminum case"}}