What Do You Recommend For a Standalone Wireless Door/Window Contact?

We are looking for a standalone wireless door contact. Below are our requirements:

1- Short range wireless under 50 ft

2- Long life, Battery operated (atleast the contact end)

3- Standalone system ( tranmitter and reciever), not linked to an alarm panel

4- The reciever will be wired to an IP camera

Thanks in advance for your feedback.

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