We gave a lot of thoughts into the time keeping part of the clock design. We wanted to create a clock that you will never have to adjust after the initial setup.
The time keeping is done with a dedicated rechargeable coin cell battery that's built in to both the base and plus models of Oboo clock. We included it in the plus model just in case the battery runs dry with music streaming.
On top of the coin cell battery, Oboo clock will try to sync its time over internet on every boot and periodically after boot to make sure the time is always accurate.