Extension Gate Firm and durable Extension GateFeatures:1. Material: Alloy aluminum2. Power: 370W/550W 3. Moving Speed: 16-18m/min4. Type of Guiding Track: No Track, Single Track, Double Track5. Self-lubricate technology to prolng whell usage life, and reduce noice while sliding6. Tailor-made wearable rubber for the wheels, ensuer sliding for 320 thousands times without obvious abrasion.7. Alarm ...