Welch Allyn 3.5 V Lithium-Ion Handle:
The Welch Allyn 3.5 V Lithium-Ion Handle has twice the on-time and is half the weight of the NiCad handles and also fits more comfortably in your hand.

Features:
• Half the weight of traditional 3.5 V handles
• 120 minutes of on-time (compared to 60 minutes for standard NiCad handles)
• Low-battery indicator
• Lithium ion battery technology that has no “memory” effect
• Fits all Welch Allyn 3.5 V instrument heads