This key light uses a micro USB charging cable, NOT included in the factory packageNitecore TIP USB Rechargeable Keychain XP-G S3 light - 360 Lumens - Choice of 7 Colors

Metallic keychain light
Multiple colour temperature options available
TIP: Fitted with a CREE XP-G2 S3 LED capable of outputting 360 lumens
TIP CRI: Fitted with a Nichia 219B LED, CRI90
Integrated Precision Digital Optics Technology provides extreme reflector performance
Built-in Li-ion battery
USB rechargeable with onboard charging circuit
Dual switch design
4 brightness levels with direct access to ultralow and turbo outputs
Memory function
High-efficiency regulation circuit provides unwavering output
Advanced temperature regulation (ATR)
Built-in power indicator (Patent No. ZL201220057767.4)
Rear suspension ring capable of sustaining 30kg weight
HAIII military grade hard-anodized
Impact resistant to 1.5 metre

Dimensions
Size: 2.39 0.96 0.53(60.8mm24.5mm13.8mm)
Weight: 0.75oz (23.5g, with battery )
Accessories
Key ring