The electronic toy at the front can be activated by the baby's bouncing and hand touch with adjustable volume (for which parents are thankful). (followmum.com)
This little gadget fills the bill... easy to use, adjustable volume level, runs on batteries and can be placed anywhere. (portablefireplace.com)
Unlike other baby swings, this model has fully adjustable volume for the soothing music and nature sound. (babygearspecialist.com)