The Kress KG347E.9 chainsaw is battery operated with a clear battery charge status display, automatic chain tensioning, automatic chain lubrication and automatic safety chain brake in case of rebound. All you have to do is saw.
 
Max Voltage - 2 x 20V
Capacity - 4.0Ah
Blade Length - 40cm
Chain Speed - 18m/s
Weight (without battery) - 4.2kg
Includes - 1 chain, 1 blade, 1 blade cover