This story originally appeared on Citylab .

Tipping can be a stressful process. As soon as you order at a coffee counter or get ready to pay at a restaurant, the same familiar questions rear their ugly heads: How much money should I leave? (Something concrete, like $1 a drink at a cafe, or at least 10 percent of whatever the total is?) Do I tip less for takeout and delivery? How good was the service, really?

Its clear that some customers arent tipping enough , especially when we consider that low-wage workers rely on tips as part of their salary. Could interactive technology encourage us to fork over more money?

New tipping technology

Some customers dont tip simply because they dont have spare bills on hand, or spare change clanging around in their pockets. A new device aims to solve this issue by allowing people to tip using credit or debit cards. DipJar offers a convenient way for customers to show a little generosity: Just dip your card into the jar and remove itthe machine will deduct a preset amount ($1 in most locations). After the transaction goes through, the jar lights up and emits a sound effect to let people know a tip has been given.