Welch Allyn 3.5V Lithium Ion Rechargeable Handle Twice the on-time, half the weight and fits more comfortably in your hand. • Soft grip rheostat • Textured handle • Half the weight of traditional 3.5V instruments • 120 minutes of on-time (compared to 60 minutes for standard NICAD handles) • Made of sturdy CYCOLOY engineering resin • Low battery indicator • Lithium ion battery technology that has no 'memory' effect • Charging hole in the base • Push and twist lock connectors for fitting of heads • Single and double charging pods available.