This lawn mower from Bosch has a cutting width of 32 cm, great for more precise cutting.
From Amazon
BOSCH EasyMower 18V-32-200 1x 4,0Ah 06008B9D00
Conrad Electronic
Bosch Home and Garden Easy Mower 18V-32-200 Rechargeable battery Lawn mower w/o battery 18 V Cutting width (max.) 320 mm