This Eco-Drive Promaster Marine BN7020-09E belongs to Citizen’s top diver collection, the case is made with Super Titanium, equipped with the brand's successful solar-powered technology the Eco-Drive, the user is able to recharge the timepiece with any light source and the power unit can unable to store energy to last approximately 1.5 years under normal use condition, there is also a power reserve indicator near the 9 o'clock position, just like the fuel indicator on the dashboard of a motor vehicle.

BN7020-09E is water-resistant for 1000M, it is designed for professional diving, and the synthetic rubber strap with an extender allows you to wear it on diving suits. This is truly a serious piece of equipment.

Citizen Eco-Drive Promaster Marine 1000M Professional Titanium Diver

BN7020-09E

Movement 
Eco-Drive
Caliber: J210
Max Run, Approx 1.5yrs(Normal Use Condition)

Exterior 
Case: Titanium
Surface Processing: Duratect DLC MRK TIC
Case Size: Diameter 52.5mm, Thickness 22.2mm 
Weight 180g 
Glass: Sapphire Glass (Non-Reflection Coating)
Strap: Rubber 

Other Details 
Water-resistant 1000M 
Date Display
Super TitaniumTM (Duratect DLC MRK TIC for some parts)
Eco-Drive (recharged by any light source, no need for regular battery replacement)
Insufficient Charge Warning Function
Overcharge Prevention Function
Power Reserve Indicator
Made In Japan