An electric pole hedge trimmer like this is flexible and easy to handle. The bar has a length of 51 cm. It has a power of 550W.
From ManoMano
Black&decker - black + decker PH5551 Pole Hedge Trimmer 550W 240V B/DPH5551
Robert Dyas
Black & Decker Black and Decker 550w Corded 40cm Pole Hedge Trimmer