1. Handset Receiver For Mobile Phone 2. Radiation Protection 3. Clear Voice 4. Compatible with Iphone,Nokia, Samsung,HTC... Handset Receiver For Mobile Phone---Iphone, Nokia, Samsung ... If you wanna turn to max volume, you don't need to adjust the largest volume from the mobile phone)7. Led light, ... . Speaker diameter: 38mm8. Cord length:2m9. Plugs type:Φ3.5 mm DC plug 10. Dimension: 21*6*6.7 CM N.W ...