eg this one: https://www.amazon.co.uk/Morphy-Richards-Washable-Underblank...
All night use
NOTE: Blankets are perfectly safe to be used all night. However we recommend using the heat setting below.
•Move the heat setting on the control switch to heat level 1or 2.
These settings will provide safe and comfortable heat to sleep on all night.
These settings can be used to air the bed.
WARNING: Always ensure that the slider switch is moved to the OFF position when you get up the next day, or after airing the bed.
eg this one: https://www.amazon.co.uk/Morphy-Richards-Washable-Underblank...
All night use
NOTE: Blankets are perfectly safe to be used all night. However we recommend using the heat setting below.
•Move the heat setting on the control switch to heat level 1or 2.
These settings will provide safe and comfortable heat to sleep on all night.
These settings can be used to air the bed.
WARNING: Always ensure that the slider switch is moved to the OFF position when you get up the next day, or after airing the bed.