Philips DL8790/00OP, Wristband activity tracker, Waterproof, Black Philips DL8790/00OP. Display resolution: 192 x 192 pixels. Device type: Wristband activity tracker, Product colour: Black, Housing material: Stainless steel. Memory capacity: 7 day(s), Display: Gorilla Glass. Battery life: 4 day(s), Battery technology: Lithium-Ion (Li-Ion), Charging source: USB. Mobile operating systems supported: Android, iOS