Key features of the Blink500 Pro HM holder The compact Pro HM holder is made of high quality plastic. The holder connects to the transmitter via four contacts and a designated clip location for the TX Pro transmitter. Built-in 3.7 V / 1100 mhA rechargeable battery The Blink500 Pro HM features a built-in 1100 mAh rechargeable battery to extend the life of the TX Pro transmitter. The handheld is equipped with a USB Type C charging port. Quick pairing To pair the handgrip with a Bluetooth transmitter, simply hold down two buttons, one on the housing of the device and one on the charger of the Blink 500 Pro system. Connecting the Blink500 Pro HM handheld with two buttons) Extras included Included with the holder, you will also find a foam cover for the TX Pro transmitter and a USB-A / USB-C charging cable. Compatibility Blink500 Pro TX transmitters Specifications Power capacity: built-in 3.7 V / 1100 mAh lithium-ion battery Charging port: USB-C connector dimensions: 206.7 x 38.1 x 25.2 mm weight: 68.5 g operating temperature: 0°C to 50°C storage temperature: -20°C to +55°C Contents of the set Blink500 Pro HM Handle USB-A/USB-C cable Foam cover for TX Pro transmitter