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The sonic sunglasses were a device the Twelfth Doctor used to replace his sonic screwdriver after he abandoned it. They were worn as normal, black sunglasses with no visible difference to non-sonic versions. He used them to recall the TARDIS after it had been dispersed by the HADS "dispersal" function. He earlier hoped they weren't scratched, wich could mean that the slightest scratch could make them unusable (of course he could just be not wanting to ruin his new glasses or have been using that as a trick to get them from Davros). (TV: The Witch's Familiar)
In their first appearance he didn't use their function, he just wore them as regular sunglasses during the 3 week party when he played his guitar. The Doctor called his glasses a "wearable technology". (TV: The Magician's Apprentice / The Witch's Familiar)