Wahl Groomsman Endurance. Wahl Pro Groomsman Endurance Beard and Moustache Cordless Rechargeable Hair Trimmer. The groomsman cordless hair trimmer from Wahl is the ultimate mens accessory, especially designed for trimming and tidying up beards, moustaches, sideburns...and the hair, down there. Now you can create any shapes or styles you want. The Wahl Pro Groomsman beard and moustache cordless rechargeable hair trimmer has self sharpening blades, 6 position beard guide, 3 close trim attachments and soft touch ergonomic design for comfort and easy use.