ADJUSTABLE TIME AND FLOW: Precise Time Control (30min, 60min, 90min, and continuous mode) for safe and convenient cold treatment. Flexible Flow Rate Adjustment (L1, L2, L3, L4) to suit your needs and level of comfort. LONG-LASTING INSULATION: Large 6L water bucket with excellent insulation, ensuring hours of continuous operation. Apply enough water and ice to fit the waterline, the responsive temperature sensing can help you get desired temperature. QUIET AND SAFE: Whisper-quiet pump technology creates a silent experience for consumers, you can enjoy a quieter environment at home. Separate water with pump to prevent electric shock from leak and ensure safety while using the massager.