These are so easy to use and are changeable! Fashionablylatemom SUPRUS Electric Lighter Arc Windproof Flameless USB Lighter Rechargeable Lighter with Safety Lock for Candle BBQ Camping (Champagne Gold) 【Safety Protection Design】The candle lighter built-in automatic power-off chip protection and external safety lock switch can effectively increased safety. Designed with child safety in mind, you have to push the safety lock switch first, then press the ignition switch to work. The igniting spark will auto stop beyond 7 seconds per igniting. Restart the switch, the igniting spark will be re-ignited.