Open Settings.
Go to About.
Tap Check For Update. If an update is available, follow the on-screen instructions to install it.
After the update, the hissing sound should be gone.
Earlier models
Fixing a speaker hissing sound
On some earlier Nur Clocks you may hear a low hiss from the speaker, more noticeable through external speakers. Software version v0.2.88 fixes it.
Nur Clock 8-inch and 10-inch (1st generation)Settings → About
Updated to v0.2.88 or later and still hear it? Email support@nurclock.com and include your software version (shown on the About screen).
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Still need help?
Email support@nurclock.com and the team that makes Nur Clock will reply.