Product type: iTunes gift card 500 rubles to replenish your Russian Apple ID account.
Product category: Unique activation code
Region of activation (use): Russia (not suitable for US and other regions)
Validity: Indefinitely

Official instructions for activating a gift card:
https://support.apple.com/en-us/HT201209

Instructions for iPhone, iPad or iPod touch:
1. Open the App Store.
2. Tap the login button or your photo at the top of the screen.
3. Click Redeem Gift Card or Code. If you don´t see Redeem a Gift Card or Code, sign in with your Apple ID.

Instruction for Mac computer:
1. Open the App Store.
2. Click your name or the login button in the sidebar.
3. Click Redeem Gift Card.