Bose 869723-0010 S1 Pro+ System Battery Pack Brass Accessories low-high impedance transformer (T50k is

low-high impedance transformer (T50k is required when using a guitar amplifier)

11 rhythm styles with Smart Tap Tempo

Height adjustable

an expression pedal

Bose 869723-0010 S1 Pro+ System Battery Pack Brass Accessories low-high impedance transformer (T50k isExtend the play time of your Bose S1 Pro+ Wireless System with an extra battery or replace an existing one. This lithium ion battery provides up to 11 hours per charge and installs easily into the dedicated compartment on your S1 Pro+ for secure and reliable use. Up to 11 hours of play when used at high output levels for performance use you can count on Lithium ion battery technology provides high energy density and full output use of your S1 Pro+