Description: Multi function button, easy to operate. Independent key panel at the top, easy to operate, easy to touch. 18 hours of endurance, Built in 1000/2200mah(Optional) lithium battery, Charge for 2-3 hours and listen for about 6-8 hours. Delicate and compact, You can take it with one hand. Built in dual alarm clock function, you can set two alarm clocks at the same time. Specification: Bluetooth version: 5.0 Output power: 5W Product functions: Bluetooth connection, handsfree call, TF card play, FM Radio Material: ABS plastic Size: 85X85X85mm (Optional) A: Battery capacity: 1000mah B: Battery capacity: 2200mah Time Display Package Includes: 1x Bluetooth Speaker 1x Charging Cable Note: Conversion: 1inch=2.54cm, 1cm=0.393inch Please allow slightly 0-1cm difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed. Thanks for your understanding and attention. Wish you a pleasant shopping experience!