Yes, iTel S41 does have a memory card slot.
No. iTel S41 does not have a hybrid sim slot. It has 1 dedicated slot for MicroSD card and 2 dedicated sim card slots.
Yes, iTel S41 runs on the latest Android 7.0 and thus having support for the multi windows operations.
Yes. In fact, iTel S41 has ring indicator which blinks when you get a new notification.
iTel S41 weight is just 155 Grams.