Is there an on off switch to use with this? I could see the battery exhausting rapidly if you put it in a card with no shut off.

There is no off switch. If the card is made with the circuit complete then it will drain the battery. If the card is made so that the circuit is not complete and the person receiving the card has to push on a specific spot to complete the circuit, then the battery will not drain.

If i wanted to light up 60-90leds (entire white classroom pack in a single project) , what sort of psu would be required?

If you're driving them at 3.3V, about a 1A supply would be needed and at 5V 1.5A to be safe. Please note if you want to blink or fade the LEDs it's recommended you use the craft effects stickers, not the Chibi Chip. The craft effets stickers are expressly designed to drive very long strings of LEDs, unlike the Chibi Chip.

Once it is stuck is it permanently stuck or is it reusable?

The stickers are designed for a single use. If you are very careful and you use the right kind of paper, the sticker can be re-positioned, but the quality of the conductive adhesive bond degrades with every re-positioning.

How many leds can you light up at a time with one battery?

It depends on the color of the light. For the white LED, probably 5-6 would be a sweet spot balancing battery lifetime against brightness using a single CR2032 battery. If you want the LEDs to be brighter and/or drive more of them in parallel, try stacking two CR2032 batteries on top of each other.

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💡 Stick on the future — light up your ideas with zero limits!

BULK BRILLIANCE - 30-pack ensures you never run out for all your creative projects.
PLUG FREE POWER - Battery-free design means effortless, eco-friendly illumination.
CREATIVE FREEDOM - Perfect for makers, educators, and tech-savvy millennials pushing boundaries.
SLEEK LIGHTWEIGHT - At just 18g, these vinyl stickers add glow without bulk.
ILLUMINATE INSTANTLY - Peel, stick, and light up your circuits with zero hassle.

Chibitronics LED Sticker Mega Pack offers 30 white LED vinyl stickers that easily adhere to circuits, providing instant illumination without batteries. Compact and lightweight, these stickers are ideal for creative tech projects, educational kits, and DIY electronics, empowering users aged 13+ to innovate with effortless, eco-friendly light.

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体验不错，但跟踪更新可以更好。

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MOLLE 护套质量非常好。我对这次购买非常满意。

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Number of Pieces	30
Batteries Required?	No
Batteries Included	No
Material Type(s)	Vinyl
Target Gender	Unisex
Manufacturer recommended age	13 years and up
Manufacturer reference	E6-534D-Y48I
Product Dimensions	16.76 x 11.94 x 0.89 cm; 18 g
ASIN	B013YRLO7I

Chibitronics （チビトロニクス） LEDステッカーメガパック白

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Chibitronics （チビトロニクス） LEDステッカー メガパック 白

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Chibitronics （チビトロニクス） LEDステッカーメガパック白