What's in the box:

Magnetic Sound Hole EQ Equalizer Preamp Pickup for 39" to 42" Acoustic Folk Guitar (Black)

Features:
This pickup available for 39" to 42" folk guitar.
A great assistant to shape and amplify sound.
Excellent bass mid-range response and soft acoustic tone.
Magnetic sensor captures vibrations quickly.
Low profile, high impedance design needs no battery.
No need to drill, easy installation and removal.
strap end-pin jack with 6.35mm outlet.

Specifications:
Suitable for : 39" to 42" folk guitar (sound hole >=10cm / 4in )
Cable length: 80cm / 31.5in
Pickup size: 10.5 * 1.8 * 2.8cm / 4.1 * 0.7 * 1.1in
Product weight: 84g / 3oz
Package size: 12 * 10 * 3cm / 4.7 * 3.9 * 1.2in
Package weight: 158g / 5.6oz

Package List:
1 * Sound Hole Magnetic Pickup

Note:
Not for classical guitars.