The Pact itself is powered by the special Cure Decor pieces. To transform, the girls open the Smile Pact and set their ribbon-shaped Cure Decor inside. They then call out "Pretty Cure! Smile Charge!", then use a powder puff to spread magic onto their bodies, allowing them to change into their Cure Forms.
The Smile Pact also grants power to the Cures. It gathers fighting spirit from the Cures and changes that into energy to perform their finishing moves. Happy gets her power by squeezing her hands to fists, and screaming to the sky, Sunny by taking masculing stance, Peace by squeezing one of her hands to fist and holding Smile Pact in her other hand right in front of her, March by squeezing Smile Pact with her both hands on her pelvis, and Beauty by squeezing Smile Pact on her chest.
In addition, other Cure Decor pieces can also be inserted into the Smile Pact to grant the Cures additional abilities and items. Many of them create something little to Candy, like costumes and haircare accessories. Also placing special Cure Decor to it, it creates the Princess Candles to Pretty Cures, and later performing group attacks Rainbow Burst, and afterwards Royal Rainbow Burst.
A pale pink compact with a pink center attached to four pieces, one at each corner. At the middle rests a hot pink bow with a line of white in the middle and a gold emblem sewn to the center. Hot pink circles the rim and connects to the bow-shaped button, where a pearl rests.
The inside of the compact is white with pale pink detail. The top of the lid has a small circular mirror, while the bottom portion has seven rainbow gem buttons surrounding a stylized gold heart with wing-like hearts surrounding it. Above this is a detailed section where the Decor is inserted.