The box must be closed box to play the effect, suitable for 2-4 inch speaker use
Diameter75*65mm
Features:
*Exquisite workmanship
**Very special rubber edge
***Reasonable iron plate counterweight
****DIY Bluetooth speaker to enhance the sense of low volume is very good choice
Package content: As your choose
1pcs Woofer Radiators
OR 2pcs Woofer Radiators