Features:
This kind of AB switch is designed as electric guitar effect pedal. 
You can route your signal to two different setups by the A / B switch， even without battery.
It can minimise tone loss with true bypass design. 
High quality aluminum alloy material and components.

Specifications:
Model: JF-30
Color: Black
Material: Aluminum alloy
Input impedance: 0ω
Output impedance: 0ω
Running current: 2mA
Power: 6F 22 9V battery / DC 9V adapter (Neither included)
Item size: 11.7 * 6.7 * 4.8cm / 4.6 * 2.6 * 1.8in
Item weight: 190g / 6.7oz
Package size: 13 * 7.5 * 6.2cm / 5.1 * 2.9 * 2.4in
Package weight: 230g / 8.0oz

Package List: 
1 * Effect Pedal
1 * User Manual (English !#!amp!*! Chinese)

Note: 
This unit is without battery， put on the battery by opening the back cover with a screwdriver.