Brand new user replaceable battery kit fits transmitters for OC1, OC1-LE, VT Pro, VT3, VT4.0, VT4.1, Atom, Atom 2.0, Atom 3.0, Atom 3.1 & Compumask. This kit includes the following: New 3V CR2 battery, rubber o rings for the transmitter and silicone lube. Includes what you need to change the battery in your Oceanic Transmitter. Contained within the kit is a replacement lithium battery, the o ring you will need to seal the transmitter, and o ring lubricant. Battery kit is for transmitter only. Brand new and guaranteed to meet all factory specifications. Use by 2025