* Rechargeable battery 6V4.5AH * Discharge time is about Single tube: 4 hours/Double tube: 2 hours * Power failure emergency function * Single and double tube selection * charging indicator * Luminous indicator * Simulated AC power failure emergency test button * Handle/seat/wall * Volume: 680 (L) * 150 (W) * 115 (H) mm * Package specification: 1*4 sets