I have two complaints: 1) The sleeves are a little tight. The other end is rounded. Would be nice if it came with a second cable that had split headphone/microphone plugs, or at least they could provide a splitter. I have bought at least 5 pairs of slippers In the last couple weeks. They?re lightweight and very good for walking and running. - Charge lasts for 10-12 hours of normal usage (Incl calls). During workouts, the trainer is pretty flexible. I first noticed this after about 6 months when some water leaked in while walking on damp ground. They even cut out when they are in my shirt pocket. I bought these shoes for tennis and badminton.