Water Resistant Casing Weights almost nothing (0.26oz with batteries each) 2 x CR2016
batteries included for each keychain Now Custom made with single 22,000mcd LED!
Magnetically shielded 10 cm (4") fullrange speaker with high efficiency, balanced
frequency response. Water-repellent cone and rubber gasket. Especially suitable
as control speaker in electronic devices and as speaker for public applications
and public transport systems.