Pt needing less care than intensive care units but need cardiac monitoring. There are many kinds of patients this includes, stable MI's after a visit to ICU, post coronary intervention patients, open heart surgery patient once out of ICU, CHF, angina, stroke and tia, arrhythmmias, chronic heart patients undergoing other procedures such as hip surgery, syncope, drug overdose, carotid stents,. Just about anyone who walks in the door can end up on tele.\
There is some variability amongst hospitals as to staff ratio, iv drips, and pt types but overall they are similar. Good starting point for someone with aspirations to venture further into critcal care or someone like me who just loves that kind of unit(That is where I started as a new grad quite a while ago)
Where I work the pts are hooked up to a rectangular box weighs about 2 pounds and they can ambulate and do other activities while being monitored.