Active Clarinet sensor of high technology 
 with a built in smd preamp, 
using a mini  lithium 3 Volt  battery. 
 Output jack is built on the case. 
 This very sensor has a high output signal
with Volume and tone controls, for extra sound facilities. 
 The sensor has a big dynamic frequency range 
with elevation  on high frequencies.
 Easily installed on barrel of clarinet. 
The sensor has isolation against  humidity.
Actual size : d: 22mm x h:21mm
sound sample