I have it on my table by my chair to charge every I need. No discernable lag time in the audio was notiable and the sound seemed to be synched up perfectly. No additional tools were needed than what were supplied (a mini wrench and allen wrench. The sound is exceptional and controls are easy to access. I HAD TO GO TO . I bought these to go with the "American Bath Towels" bath sheets. Tighten. Latest update (July 10): the vendor has been communicating with us making various suggestions. Also you can adjust the volume by tapping twice on right side ear bud for up and vice versa on left ear bud. Theyre durable and last for years.