Must purchase the BC30 V2.0 Bike light. Made exclusively for the Fenix BC30 V2.0 Bike Light, this accessory pack comes with everything you need to cycle safely. It comes with a Fenix BC05R V2.0 Tail Light, to keep those behind you aware of your presence, and two ARB-L18-3400U V3.0 rechargeable batteries and a ARE-A2 charger for all the power you need to keep you going long into the night—all for a great low price!