Philips DL8792/00, Wristband activity tracker, Waterproof, Black Philips DL8792/00. Display resolution: 192 x 192 pixels. Device type: Wristband activity tracker, Product color: Black, Housing material: Stainless steel. Memory capacity: 7 day(s). Battery life: 4 day(s), Battery technology: Lithium-Ion (Li-Ion), Charging source: USB. Mobile operating systems supported: Android, iOS