LED Indicator Lights: It should have 4 power indicators (25%, 50%, 75%, 100%) so you know how much power is available.... An LED flashlight that works perfectly in darkness, especially for emergency.
Compact size design for portability.... Weight about 0.2kg. Not bulky.
The rubber oil paint surface process allow it have Rain/Dirt/Shockproof feature to protect it.
Solar Panel Charger : can store 500% of the average smartphone's battery life. *ZeroLemon 26800mAh Solar
*Solar Panel Build-in 5000mAh Lithium Polymer battery which chareges via a 1.2W monocrystalline solar panel ; 2.1A output allows for simultaneous charging of your devices.
Compatible with most kinds of 5V USB-charged devices iPhones,iPads,Android phones,Samsung, PSP, GPS Units, Digital Camera,etc.
It should also have a port to be able to charge it using electricity when the weather is cloudy. That's a Backup)
11 freelancers are bidding on average $656 for this job
I could make you parts list and estimate of design time to make a prototype, for the bid price Stay tuned, I'm still working on this proposal.