outdoor player: 1.high quality&safty 2.with international standard 3.built-in control 4.OEM availible outdoor player: 1.Functions:Strengthening the muscles in upper limbs,shoulder an back region;Improving the flexibility,agility and coordination of shoulder joints and elbows;Good for Healing bending and stretching hindrances of joints,frozen shoulderand tennis elbow,etc. 2.Usage scope:Residential ...