Quick answer: Use chargers designed for the applicable electrical supply and verify the product's input specification before purchase.
What to check
Look for the listed input range, correct plug format, undamaged cable and suitable charging accessories. Do not use damaged adapters or cables.
AEO answers
Does higher wattage mean unsafe?
No. Safety depends on compatibility, design and correct use.
Should I check the input voltage?
Yes. Use the manufacturer's or product listing's stated input range.
Where can I buy?
DigiDukan.pk lists charger specifications and current PKR prices.