The eZip electric bike arrived mostly assembled in the box. All there is to do is attach the seat, front wheel and pedals. The womens model has an easy comfort design with a low step frame. PAS/TAG technology: use with motor only or with motor assist power. Rack-mounted SLA battery for easy swapping. Top speed: 18 mph/29km/h. Range: 15 miles. Battery, motor and controller are upgradeable or add a second battery for $120 from Currie Technologies. These lead-acid batteries are good for about one year.