Chip: TI CC2540; Supports AT instruction; Suitable for remote control game controller data collection and smart home appliances etc.; Also can be as one of Shield; Working frequency: 2.4GHz ISM band; Modulation: GFSK; Transmitting power: -23dbm -6dbm 0dbm 6dbm; Sensitivity: <=-84dBm at 0.1% BER; Transmitting speed: Asynchronous: 6K bytes Synchronous: 6k Bytes; Support service: Central & Peripheral UUID FFE0 FFE1; Power consumption: working current: <15mA; Searching current: <30mA; Sleep current: <3mA; Power supply: DC 5V; Working temperature: -5~65'C; Communication distance: 100m; Size: 68 x 43mm; With two puzzle connectors; Hard or softserial port for transmitting port; Reserved pinouts from HM-11; With Reset button