Main features of QQ-2:
# Automatically returns to charging base for recharging when low on battery power
# Resumes cleaning for 40 minutes after battery recharge completion
# Auto-off feature conserves power when unit is not in use
# Return unit to charging base with compact size remote control
# Longer cleaning time (up to 70 minutes in one charge)
# 3 1/2 hours quick battery charging
# Nickel metal hydride (NiMH) 2500 mAh battery: 500+ recharging cycle