Rechargeable Lithium Ion battery technology is the same as what you'll find in your laptop computer and is far superior to alkaline batteries
Low battery indicator
Smart Rapid Charger ensures longer battery life, and compatible with 100 ~ 240 volts for use worldwide
Charges from USB port of computer or an electrical outlet.
Full charge from empty to ready in about 5 hours
Med: 2:30 hours
High: 1:40 hours
Steady Pulse: 3:00 hours
Low: 10:00 hours
Daylight Flash: 25:00 hours
Quick release bike mount
Weight: 110 gr / 3.88 oz
LED Output: 420 lumens
CygoLite lighting systems come with a 1 year limited warranty against any defective part or craftsmanship. The lamps and batteries are warranted 30-90 days after the original date of purchase (Dependent on the specific light system. For more details on the lamp and battery warranty, refer to your light system manual). If the unit is under warranty, CygoLite will repair or replace defective components at no charge provided the product has not been subject to misuse, abuse, or non-CygoLite authorized alteration, modification or repair. Warranted products requiring service must receive a Return Merchandise Authorization number (RMA#) from customer service.
Nice and bright. Attaches easily to bar and would be easy to pop off, if needed. USB charge in back is easily accessible, and I think doesn't require removal from the bike, but i'm not sure of this. I'm happy with this purchase.