One plus 3T - Manual (Page 32)

32 | What’s in the Box Device OxygenOS Safety Information
E-Waste Disposal Declaration
E-waste refers to discarded electronics and electronic equipment (WEEE). Ensure that an authorized agency repairs devices when needed.
Do not dismantle the device on your own. Always discard used electronic products, batteries and accessories at the end of their life cycle;
use an authorized collection point or collection center.
Do not dispose of e-waste into garbage bins. Do not dispose of batteries into household waste. Improper disposal of waste may prevent
natural resources from being reused. Some waste contains hazardous chemicals if not disposed properly and may release toxins into the soil
and water, and may also release greenhouse gases into the environment.
| What’s in the Box Device OxygenOS Safety Information