Bone Conduction Speaker-- It's the world's smallest bluetooth speaker that can turn anything hallow into a speaker. It will give you a DIY sound experience, just place it on different surfaces such as luggage box, guitar, wooden desk, pillow, cardboxes. Differnet surfaces, differnt sound effects.Super Mini Speaker in Tiny Size-- The diameter of the speaker is about 4cm/1.6inches, small and portable, you can put it in your pocket or bag, carrying it anywhere anytime. A very suitable gift for Christmas, Halloween, thanksgiving Day, New Year, Back to Shcool, birthday gift for sons, father and friends.Small But Powerful Speaker -- the humbird speaker can be quite powerful reaching up to 115db, and it allows you to customize the tone quality. It's suggested to workon thin object, such as hallow plastic box or bucket.Easy Bluetooth Pairing--The bone conduction speakers are connected by bluetooth. Two humbird speakers bluetooth can be paird automatically, which will give True wireless stereo sound experience.We highly recommend you to choose 2pcs/pack,getting two interconnected speakers, you will enjoy 2.0 surround sound experience since this innovative Bluetooth enabled device is also TWS enabled.Multiple Function Speakers-- The humbird bone conduction speaker can play music, podcasts,support separate phone conversations or conference calls, play games or movies. The Bone Conduction Speaker also used as FM radio allows you to listen to music, follow podcast.