Headphones for Horses!
Wait...what...there's such a thing as horse headphones!
Yup. French firm Horsecom not only makes a Bluetooth headphone for a horse, but they also make a wireless headset for the rider that allows clear voice communication with the horse or another trainer on the ground, and allows the rider to answer a cell phone. Who'd have thunk it? Makes sense I suppose, horses move around a lot, so just like with you and me, a nice set of portable headphones is a good way to go.
Review sample not requested.