No battery, No onboard electronics, Just the pure pickups.

3 Transducer Pickup System fit for most string music instruments, amplify an upright bass, banjo, violin, ukulele, viola, cello, mandolin, classical guitar, and a resonator guitar.
No Battery Required, No Soldering Required, pre-wired piezo mic save time for you, easy to install, convenient to use.
Material: Plastic
Electronic Part: Metal
Color: black lines, silver tone
Cable Length: approx. 57cm/ 22.44″
3-pack Piezoelectric Disk Dia.: approx. 27mm/ 1.06″
Endpin Jack Dia.: approx. 6mm / 0.25″

Package Contents:
1 x Pickup
1 x cable fixed mount square
6 x Celluloid guitar picks

Instruction:
1. Take the plastic film down from the back of transducer to expose the adhesive
2. Place the transducer through the sound hole to the lower part of the front body where the guitar produces the best tonal response
3. Drill a hole from inside the body, loosen the end-pin jack nut, insert it to the hole and tighten the nut

Tips:
★Where is the best place to stick the mics ?
Depends on what instrument you are trying to mic. Most instruments the best placement will be directly underneath the saddle/bridge.
★What is the little square plastic piece for ?
You can thread the wire tie thru it in place, then stick the square out of the way and secure the excess cable to it.
★How to use the Self-adhesive ?
Remove the plastic film from the back of the transducer to expose the adhesive.

Warranty: 1 year quality warranty, response Within 24 hours

Product Features

• 3 Transducer Pickup System fit for most string music instruments, amplify an upright bass, banjo, violin, ukulele, viola, cello, mandolin, and a resonator guitar
• The plastic squares is a self adhesive block to mount the extra wire in your box, mixed color 6 Pieces celluloid guitar picks: thin medium 0.46mm / 0.71/ 0.96mm for Free, the best material will be very durable
• No Battery and Soldering Required, pre-wired piezo mic save time for you, easy to install, convenient to use
• Cable Length: approx. 57cm/ 22.44″, 3-pack Piezoelectric Disk Dia.: approx. 27mm/ 1.06″, Endpin Jack Dia.: approx. 6.35mm / 0.24″
• Material: Plastic, Electronic Part: Metal, Color: black lines,silver tone