Portable Wireless Bluetooth Speaker includes the following features : 

• Bluetooth version: 5.1
• Effective distance: <= 10 meter
• Speaker: 40 mm
• Power supply mode: DC 5V, polymer 400mah with protection
• Playing time: 4 hours
• Charging time: 3 hours (5V/1.0A input)
• Signal-to-noise ratio: >= 90db
• Frequency: 100-18KHz
• Portable to carry with lanyard
• Type-c charging cable included

Material :

• ABS housing

Size closed :

• Length of 7.7 cm x Width of 7.7 cm x Thickness of 3.95 cm