SPECIFICATIONS: Input: AC 100-240V 50/60Hz,Cable length: total:4ft/1.2M,Plug: Game Link Cable for GBP GBL FUNCTIONS:Allows 2 to be connected together for 2 player gaming. Into the game, choose 2 players and both consoles hang. SAFE TO USE: Got the CE certificate with short circuit protection, over-current protection, over-voltage protection and overload protection, safe to use. 2-YEAR WARRANTY：Just contact us any time you want for the problem of the product, we will try our best to solve your problem. And if the doorbell transformer defected while using within 2 years, please also contact us, we will replace a new one for you and you don't need to return the defective one. COMPATIBLE WITH Nintendo Gameboy Color, Gameboy Pocket/ Light consoles. Not compatible with Nintendo Gameboy Advance/ SP consoles.