BLE + Sensors + Battery in a plastic. We already done 85% of your product.
SensiTHING Environmental Monitoring Module with Wireless Charging Capability
Application note: How to add AA battery To SensiBLE 1.0 or SensiSUB 1.0
An easier path to IoT development
with SensiBLE and Arduino
Getting started with SensiEDGE BLE & CloudThing Cloud Service
How to Read Temperature and Humidity with SensiEDGE || SensiBLE
What is SensiEDGE || SensiBLE?
5 Steps Connect SensiBLE to IBM || Sensor to Cloud