Aoyue 9070 Ultrasonic Cleaner for Circuit Boards, 5 Liter Capacity Temperature control enables the system to quickly heat up to optimum cleaning temperature Sweep frequency, eliminates damages to sensitive components by continuously varying the frequency Unique, innovative design with digital control panel and display provides precision control Power control feature, adjust cleaning power from 60-100% to cater to various cleaning requirements. Auto-load following feature, allows the system to automatically adjust the cleaning power