This is normal if the power pack has been discharged, and the the low power buzzer alert has been activated. Simply recharge the pack per the product instructions, and the pack will function normally.
If the pack was recently recharged, the power indicator button may have been held putting the pack into “demo mode”. To reset the pack, disconnect from furniture and connect to a powered Enouvation charger. Once a green light is blinking or you have 4 solid green lights, disconnect from charger, and reconnect to furniture. The furniture and pack should operate normally without the audible alert.