Product 1: Usb-ttl included
Product 1: 10 gpio, every gpio can be pwm
Product 1: Pcb antenna; I2c, 1-wire, plug & play
Product 1: weight: 60 gms
Product 2: Size: 75mm (length) x 55mm (w) x 19.3mm (height)
Product 2: Weight: 58g
Product 2: Pcb color: blue
Product 2: board four weeks with four screw holes, hole diameter 3.1mm, easy to install and fixed