SPECS: Diameter: 2.5" Weight: 3.9oz DESIGN & DETAILS: Included: Ball only Durable LED Ball for nighttime play Motion activated Auto shut-off after 10 minutes of inactivity Durable rubber construction Waterproof - it floats! 2 replaceable CR2032 batteries included Model: GSB-07-R7 TECH SPECS: Run time: 35 hours