Features:1. No binding pin is designed, the receiver has an "autobind" procedure just like with small quad helicopters. When switch on, receiver tries to bind with transmitter for about 3s (led flashes). If receiver finds a transmitter (must also be in bind mode) then it registers transmitter identifier and works with it.2. If it can't bind with a sender then it gets previously bind sender identifier and works with it. This way, you save an extra pin and just have to tie only once.3. After bind procedure, if reception is ok then led if on, if no reception on all led if off, if reception if bad led flashes randomly. Description:Generally this DSM/2 could support all JR and transmitter. It can also support WALKERA DEVO 10 and DEVO 7E with deviation firmware. Specifications:Brand:HappymodelItem Name: DSM/2 Micro RC ReceiverChannels: 5 Channels PWM (6 Channels PPM)Receive Sensitivity: -99dBmFrequency Range: 2.4-2.48GHzPower: 3.7-5V DCWeight: 0.28gAntenna Length: 30mmSize: 9.5mm * 10.5mm * 2.5mm Package Included:1 *DSM/2 5CH Micro ReceiverNotes:1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.