4 000 mAh lithium batteries suitable for all models of LENZ heated products (except insoles) that you can control directly on the body of the cell or via the Bluetooth application on your smartphone. The batteries last for up to 22 hours per charge. DESCRIPTION rechargeable lithium pack The lithium pack is connected to the respective product with snap buttons Heating output can be controlled with the free smartphone app (9 heating levels) or directly on the lithium pack (3 heating levels). small, light (approx. 115 grams) and compact Charging cable with USB-C connection convenient charging in the charging cradle Also compatible with charger from rcB 1200, rcB 1800 and heat pack PACKAGE CONTENTS 2 lithium packs rcB 2000 (rechargeable) 1 USB-C charging cable charging cradle You can control the power of heating directly on the battery - 3 levels or remotely through the LENZ application on your smartphone - 10 levels. The LENZ application is available on these links: App store Google play