No one is going to redesign the module, engineer a shield, pay for FCC/CE/RoHS certification, package and ship for $4.00. They would probably need to sell 25,000 modules just to break even. Certified modules are going to cost significantly more than $4.
No one is going to redesign the module, engineer a shield, pay for FCC/CE/RoHS certification, package and ship for $4.00. They would probably need to sell 25,000 modules just to break even. Certified modules are going to cost significantly more than $4.