POWER: The electric engraver pen powerful 32,000 Rpm motor is powered by just 1pcs 10440 rechargeable lithium battery and enables engraving in Metal, Wood, Plastic, Leather, metal, ceramic and plastic. HIGH QUALITY: The head of pen engraver machine (1mm) is made of high strength, super wear resistant and impact resistant diamond, and has a longer service life. engraving tool body is made of aluminum. compact engraver has ergonomic tri-lobal grip and precise fingertip control. Packing List: 1Electric grinding pen, 1Charger, 110440 Lithium-ion battery, 2Blue rubber cover, 1Allen wrench, 3 Diamond Pen needle, 1Box. Battery voltage: 3.7V. Current: 800mAh. Speed: 32,000 rpm. Dead time: 110 minutes. Grip length: about 20mm to 30mm/0.79'-1.18', 25mm/0.98' best. EASY TO USE: Hold the diy engraver pen like a pencil with your thumb over the control button, applying slight pressure on the surfaces. electric engraver etching craft tool perfect for starters and professionals. LIGHTWEIGHT AND ERGONOMIC DESIGN: Cordless engraving pen small size, light weight and easy to carry, you could hold the precision carving tools like a pen to do complex work without excessive stress on your wrist or hand. Parameters: Name:MiniRechargeableElectricGrindingPen Size:about112.5*12.5mm/4.43*0.49' Gripingshankdiameter:about2.35mm/0.09' Griplength:about20mmto30mm/0.79'-1.18',25mm/0.98'best Batterytype:10440rechargeablelithiumbattery Batteryvoltage:3.7V Current:800mAh Speed:32,000rpm Deadtime:110minutes Features:precisionandcompact,wirelesslithiumbattery,strongpower,non-slipsiliconesleeve,morecomfortabletohold Scopeofapplication:Itcanbeutilizedforcarvingandgrindingofvariousstone,wood,olivenucleus,PCBcircuitboard,plastics,andeggsdetail,orforrustremovalandsmallworkpieces'trimming.Itcanalsobeutilizedforthecharactersandimagecarving,polishingandinscriptiononthesurfacelikestainlesssteel,glass,ceramics,etc. Packinglist: Electricgrindingpen*1 Box*1 Charger*1 10440Lithium-ionbattery*1 Bluerubbercover*2 Allenwrench*1 Penneedle*3