Light Rainproof Solar Cell Display Five Languages Solar EnergyInformation about solarcells This bicycle computeris equipped with solar thattransform light energyinto electricityThis extends the useful life of thebattery .However , batteries areneeded for to supplyenergy when it is dark . Bike A / B selectionPress [ SET ] button for two seconds to select bike A or Bike B Application: Road Bike Battery: 2*CR2302 button battery Waterproof: Daily waterproof Installation position: Handlebar Display Five Languages(English, Deutsch, France, Dutch, Espanol) Transmitting distance: the max 80cm Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:Black Material:ABS Specifications: white light Package Contents: 1 x Bracket 1 x Magnet 2 x Rubber Sheet 1 x Sensor 1 x Plastic Belt 1 x Wireless Computer 1 x Rubber Ring Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.