Amazon.com: iPhone 4s Cable, 30-Pin USB Sync and Charging Data Cable for iPhone 4/4S/3G/3GS, iPad 1/2/3, and iPod (5'/1.5 Meter) - Pack of 2 : Electronics
About Apple USB power adapters - Apple Support (IN)
New Apple iPhone 4s Charger (USB Adapter And Cable) | xParts
USB Charger, Certified 2.4A 2-Port USB Wall Charger Portable Travel Power Adapter Compatible for Apple iPhone X 8/7/6 Plus SE/5S/4S,iPad, iPod,Samsung Galaxy S7 S6, HTC, LG, Tablet, Motorola (2-Pack) - Walmart.com
About Apple USB power adapters - Apple Support (IN)