Strapless Heart rate monitor with a battery life of 14 hours

Hi guys,

I have a heart condition and I’m looking for a strapless heart rate monitor with a battery life of at least 14 hours, comfortable to wear,

I don’t need any fancy function, I just need to check my heart rate and not go over 105 bpm, I would also need an alarm when I go over that threshold,

Are the strapless monitor comfortable to wear all the day long?, any better than the strap?

Thank you very much.