•Size: 8 x 3.1cm •Dot-matrix: 7 x 21 (147 dots) •Two kinds of power: embedded 3V lithium battery and 12V vehicle power supply •Battery: embedded 1pc of CR 2032(3V), operation up to 20 hours. •Can be powered by vehicle 12V power supply •Holds up to 6 messages in memory (up to 512 characters for first message, and 256 characters for others message) •Supports English display •9 speed and illumination levels. •Input by hand on back of badge. •Colors: Red, Blue, Green, White, Pink, Yellow, etc. •Attaches to blouse or lapel by a pin on back •Magnetic adsorption •Available for some public places such as company, exhibition, club, cinema, and hotel •Reminders: Keep it from water while in use Avoid surface damage, and keep it from falling Re-set battery while the light isn't enough for the brightness or is failing to start Keep your hand from touching the plate of the electronic component while working. Product size: 8*3.1*0.75cm N.W: 25.2g, G.W: 35.6g Volume of packing White box: 8.8 * 5.5 * 2.5cm 144pcs in a ctn Ctn: 35*27*25cm GW: 6KG