ECHO CST-58V4AH 58-Volt Lithium-Ion Brushless Cordless String Trimmer with 4 Ah Battery Brushless motor for superior power, run time and durability. Includes 58-Volt 4 Ah lithium-ion battery and 58-Volt lithium-ion charger. Variable speed trigger for ultimate power control. High/low speed switch for more power or extended run time. Speed-feed dual line bump feed head for easy reload. Includes 0.095 in. and 0.080 in. silent twist line. 14 in. - 16 in. adjustable cutting diameter for extended run time or more aggressive cutting.