External Batteries Compartment for Watch Winder | Use A *2 pieces for Longer Battery Lifetime, Not Includes Battery

External Batteries Compartment Use Batteries A*2pcs, Which Batteries Capacity is 5 Times VS to Internal Built in Compartment (AA*2pcs) Inside The Watch Winder. Not Includes Battery.

External battery compartment (A *2pcs) for one holder watch winder 

Battery life: Mode 2---20 days; Mode 5---10 days; 

External battery compartment (A *2pcs) for two holders watch winder 

Battery life: Mode 2---10 days; Mode 5---7 days