answer call lights, assist patients with needs (ADLs/toileting/bathing (some units only do baths on nights)/incontinence care/oral care especially on the intubated patients), turning, vital signs, accuchecks, putting on telemetry leads, phlebotomy, stock...there may be more in your job description. When I worked as a tech we were allowed to insert foleys, IV's, do trach care/suctioning, blood cultures and do dressing changes. We would also run specimens to the lab, typically blood culture bottles because we weren't supposed to chute those. we would also help with patient transfers...and sometimes other misc. duties. We once had a patient who was a former nurse that was mean to everyone else but I somehow had a special connection with her lol. She had to go for a bone scan and was terrified...so the primary RN asked me to go down with the patient to ease her anxiety.
One random thing I liked doing (and the nurses I worked with appreciated this, too) was assembling "blood draw bags"...our machine would print the lab labels that were needed, so I would take them and stick them in the side pocket of the biohazard bag and assemble everything needed to draw blood (tourniquet, colored tubes, vaccutainer, butterfly needle, some alcohol swabs and some cotton balls). I would also do the same for central lines - as techs we were not allowed to draw off central lines but your hospital may be different.
Overall just ask the nurses if they need help with anything - make yourself available. being a tech can be hectic, especially if you are the only one on the floor. let the nurses know where you will be and when you step off the unit/go on break.