The "Baby Toy MJ054 Mobile Water Game" appears to be a version of the classic handheld water ring toss game designed to look like a mobile phone or small console.

Based on general product descriptions for similar items, here are the likely details:

Type of Toy: A manual, handheld water game, often referred to as a Water Ring Game or Water Bubble Ring Game. It does not require batteries.

Gameplay: The objective is to press one or two buttons to create water currents or bubbles to maneuver small, colorful rings onto pegs or posts inside the water-filled chamber.

Design: It is likely a small, compact, and lightweight plastic device shaped like a miniature phone or gaming handheld, making it easy to carry.

Material: Typically made from safe, environmentally friendly ABS plastic.

Age Range: Generally recommended for children 3 years old and up (though some variants are listed for 4-6 years).