The product in this link is a CR2032 battery powered.Suitable for Batman, Iron Man, Black Panther, etc. The eye for the mask should be smaller than is 27.5X69.5MM. If it is larger than this size, there will be a gap.
eBay
Large Rectangle Led Eyes Light Decorations Flexible Bendable Helmet Shine Eye Lights DIY Kit for Cosplay Mask Accessories Gift
Aliexpress UK
The product requires two 7# AAA batteries powered.Suitable for Batman, Iron Man, Black Panther, etc. Toddler Safety Harness Baby Anti Lost Wrist Link Kids Outdoor Walking Hand Belts. UK HEATER BLOWER RESISTOR For FORD B-MAX C-MAX FOCUS KUGA ECOSPORT 1804471.
eBay
Remote Control Sensing led Light Flexible Bendable Helmet Eyes Lights Mask Eye Cosplay DIY kit Halloween Accessories Can Cropped
Aliexpress UK
The product in this link is requires two 7# AAA battery powered.Suitable for Batman, Iron Man, Black Panther, etc. Note: When the lamp is DIY, be sure not to remove the white reflective film on the lamp, because removing the reflective film will cause the lamp beads to fall off during use.
eBay
Halloween Mask DIY LED Light Eyes Kits FOR Bruce Helmet Cosplay White Eyes Light Masks Accessories Cr2032 or AAA
Aliexpress UK
Package included: 1 x LED Light ( without batteries).
eBay
DIY Led Eyes Light Kits for Halloween Helmet Mask Glow Eyes Cosplay Prop Lights Accessories Cannot Bend Style Size 27.5X69.5MM
Aliexpress UK
The product requires two 7# AAA batteries powered.Suitable for Batman, Iron Man, Black Panther, etc. We only provide the LED eye accessories in the picture, not the mask. When the light is on, you will not see the outside.
eBay
70X90mm DIY Helmet Mask Eye Lights Cosplay Modified Props Bendable Flexible Led Light Eyes, Can Be Cropped
Aliexpress UK
Size: Lamp Size: 22mm 64mm, thickness 2.3~2.4mm, LED at about 2.6mm (effective light emitting size 22mm 57mm). The product requires two 7# AAA batteries powered.Suitable for Batman, Iron Man, Black Panther, etc.
eBay
NEW 27.5X69.5(76.5)mm Light Board Halloween DIY LED Light Eyes Kits for Cosplay Helmet Mask Accessories Props CR2032 Battery
Aliexpress UK
Suitable for Batman, Iron Man, Black Panther, etc. DIY mask material is preferably PVC material or hard mask. Lamp Size: 23mm 63mm, thickness 2mm, LED at about 2.6mm. 1 x LED Light ( without batteries).
eBay
1/5pcs Halloween Horror Red Eye Glasses Led Glowing Glasses Scary Horror Eyewear Cosplay Party Funny Luminous Glasses Props
Aliexpress UK
Package included: 1 x LED Light ( without batteries).
eBay
22 X 57MM Hard Eye Lights Halloween DIY Light Eyes Kits for Bruce Wayne Helmet Mask Glow Eyes Modified Cosplay Prop Accessories
Aliexpress UK