i have the liveryman whisper which are very quiet & the battery is attached to the clippers themselves as opposed a pack round your waist. however they only have 45-60mins battery life so you have to be a quick clipper or invest in another battery. pricey to buy but their quiet running makes even the more difficult horses to clip much easier!
Another for lister libertys! My battery lasts over 2 1/2 hours as thats how long it takes me to clip.
Fab clippers!
I looked at the arena harmonys but they're not powerful enough I was told to be doing full / lots of clips on horses who grow a bit of hair- ok for types who dont grow much coat- also don't think the battery lasts that long.
I have the liveryman Harmony cordless ones, they're my first pair of clippers and I did a chaser clip on George no problem, very quiet and light to use.