Catchbox Wireless Charger charges the built-in Li-ion rechargeable batteries for Catchbox transmitters. Currently only compatible with Catchbox Plus transmitter capsule. LED Charger Indication on the wireless charger let’s you know the battery state. The wireless charger also enables the “Always-On” functionality, where Catchbox enters sleep mode when charging and automatically detects when picked up to switch on without the need to toggle any on/off switches.