This is a penlight socket holder that uses three AAA batteries. Confirmed to work with NCT (new/old) penlights, Treasure, and Girls' Generation penlights. Customers have also reported that it works with aespa (new/old), WayV, SEVENTEEN (ver1/ver2/ver3), BTS, Park Bo-gum, Stray Kids (new/old), TWICE, SHINee, B1A4, OHMYGIRL, NIZIU, 2PM, EXO (new/old), Wei, fromis_9, ENHYPEN, and INI penlights ◠‿◠ Shipped anonymously via Yu-Yu Mercari. Will be wrapped in cushioning material and packaged with waterproof measures. *Batteries are not included. Thank you. Keywords: Penlight Penlight Socket Socket Penlight Batteries Penlight Battery Holder Penlight Battery Case Penlight Battery Battery Case NCT NCT127 NCT DREAM TREASURE aespa WayV SEVENTEEN BTS Park Bo-gum Stray Kids TWICE SHINee B1A4 OHMYGIRL NIZIU 2PM EXO Wei fromis_9 ENHYPEN INI