The Dyson Purifier remote contains a button battery. Please read Important safety instructions for product containing button/coin batteries.
WARNING. Chemical burn and choking hazard. Keep batteries away from children (whether the battery is new or used). This product contains a lithium button/coin cell battery. If a new or used lithium button/coin cell battery is swallowed or enters the body, it can cause severe internal burns and can lead to death in as little as 2 hours or less. Always completely secure the battery compartment. If the battery compartment does not close securely, stop using the product, remove the batteries, and keep it away from children. If you think a battery might have been swallowed or placed inside any part of the body, seek immediate medical attention. The button/coin battery is located inside the remote control.